A new criterion for assessing discriminant validity in variance-based structural equation modeling
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Abstract
Discriminant validity assessment has become a generally accepted prerequisite for analyzing relationships between latent variables. For variance-based structural equation modeling, such as partial least squares, the Fornell-Larcker criterion and the examination of cross-loadings are the dominant approaches for evaluating discriminant validity. By means of a simulation study, we show that these approaches do not reliably detect the lack of discriminant validity in common research situations. We therefore propose an alternative approach, based on the multitrait-multimethod matrix, to assess discriminant validity: the heterotrait-monotrait ratio of correlations. We demonstrate its superior performance by means of a Monte Carlo simulation study, in which we compare the new approach to the Fornell-Larcker criterion and the assessment of (partial) cross-loadings. Finally, we provide guidelines on how to handle discriminant validity issues in variance-based structural equation modeling.
Keywords
Structural equation modeling (SEM) Partial least squares (PLS) Results evaluation Measurement model assessment Discriminant validity Fornell-Larcker criterion Cross-loadings Multitrait-multimethod (MTMM) matrix Heterotrait-monotrait (HTMT) ratio of correlationsIntroduction
Variance-based structural equation modeling (SEM) is growing in popularity, which the plethora of recent developments and discussions (e.g., Henseler et al. 2014; Hwang et al. 2010; Lu et al. 2011; Rigdon 2014; Tenenhaus and Tenenhaus 2011), as well as its frequent application across different disciplines, demonstrate (e.g., Hair et al. 2012a, b; Lee et al. 2011; Peng and Lai 2012; Ringle et al. 2012). Variance-based SEM methods—such as partial least squares path modeling (PLS; Lohmöller 1989; Wold 1982), generalized structured component analysis (GSCA; Henseler 2012; Hwang and Takane 2004), regularized generalized canonical correlation analysis (Tenenhaus and Tenenhaus 2011), and best fitting proper indices (Dijkstra and Henseler 2011)—have in common that they employ linear composites of observed variables as proxies for latent variables, in order to estimate model relationships. The estimated strength of these relationships, most notably between the latent variables, can only be meaningfully interpreted if construct validity was established (Peter and Churchill 1986). Thereby, researchers ensure that the measurement models in their studies capture what they intend to measure (Campbell and Fiske 1959). Threats to construct validity stem from various sources. Consequently, researchers must employ different construct validity subtypes to evaluate their results (e.g., convergent validity, discriminant validity, criterion validity; Sarstedt and Mooi 2014).
In this paper, we focus on examining discriminant validity as one of the key building blocks of model evaluation (e.g.,Bagozzi and Phillips 1982; Hair et al. 2010). Discriminant validity ensures that a construct measure is empirically unique and represents phenomena of interest that other measures in a structural equation model do not capture (Hair et al. 2010). Technically, discriminant validity requires that “a test not correlate too highly with measures from which it is supposed to differ” (Campbell 1960, p. 548). If discriminant validity is not established, “constructs [have] an influence on the variation of more than just the observed variables to which they are theoretically related” and, as a consequence, “researchers cannot be certain results confirming hypothesized structural paths are real or whether they are a result of statistical discrepancies” (Farrell 2010, p. 324). Against this background, discriminant validity assessment has become common practice in SEM studies (e.g., Shah and Goldstein 2006; Shook et al. 2004).
Recommendations for establishing discriminant validity in prior research
Reference | Recommendation | |
---|---|---|
Fornell-Larcker criterion | Cross-loadings | |
Barclay, Higgins, and Thompson (1995) | ✓ | ✓ |
✓ | ✓ | |
Fornell and Cha (1994) | ✓ | |
Gefen and Straub (2005) | ✓ | ✓ |
Gefen, Straub, and Boudreau (2000) | ✓ | ✓ |
Götz, Liehr-Gobbers, and Krafft (2010) | ✓ | |
Hair et al. (2011) | ✓ | ✓ |
Hair et al. (2012a) | ✓ | ✓ |
Hair et al. (2012b) | ✓ | ✓ |
Hair et al. (2014) | ✓ | ✓ |
Henseler et al. (2009) | ✓ | ✓ |
Hulland (1999) | ✓ | |
Lee et al. (2011) | ✓ | ✓ |
Peng and Lai (2012) | ✓ | |
Ringle et al. (2012) | ✓ | ✓ |
Roldán and Sánchez-Franco (2012) | ✓ | ✓ |
Sosik et al. (2009) | ✓ |
While marketing researchers routinely rely on the Fornell-Larcker criterion and cross-loadings (Hair et al. 2012a), there are very few empirical findings on the suitability of these criteria for establishing discriminant validity. Recent research suggests that the Fornell-Larcker criterion is not effective under certain circumstances (Henseler et al. 2014; Rönkkö and Evermann 2013), pointing to a potential weakness in the most commonly used discriminant validity criterion. However, these studies do not provide any systematic assessment of the Fornell-Larcker criterion’s efficacy regarding testing discriminant validity. Furthermore, while researchers frequently note that cross-loadings are more liberal in terms of indicating discriminant validity (i.e., the assessment of cross-loadings will support discriminant validity when the Fornell-Larcker criterion fails to do so; Hair et al. 2012a, b; Henseler et al. 2009), prior research has not yet tested this notion.
In this research, we present three major contributions to variance-based SEM literature on marketing that are relevant for the social sciences disciplines in general. First, we show that neither the Fornell-Larcker criterion nor the assessment of the cross-loadings allows users of variance-based SEM to determine the discriminant validity of their measures. Second, as a solution for this critical issue, we propose the heterotrait-monotrait ratio of correlations (HTMT) as a new approach to assess discriminant validity in variance-based SEM. Third, we demonstrate the efficacy of HTMT by means of a Monte Carlo simulation, in which we compare its performance with that of the Fornell-Larcker criterion and with the assessment of the cross-loadings. Based on our findings, we provide researchers with recommendations on when and how to use the approach. Moreover, we offer guidelines for treating discriminant validity problems. The findings of this research are relevant for both researchers and practitioners in marketing and other social sciences disciplines, since we establish a new standard means of assessing discriminant validity as part of measurement model evaluation in variance-based SEM.
Traditional discriminant validity assessment methods
Comparing average communality and shared variance
In their widely cited article on tests to evaluate structural equation models, Fornell and Larcker (1981) suggest that discriminant validity is established if a latent variable accounts for more variance in its associated indicator variables than it shares with other constructs in the same model. To satisfy this requirement, each construct’s average variance extracted (AVE) must be compared with its squared correlations with other constructs in the model. According to Gefen and Straub (2005, p. 94), “[t]his comparison harkens back to the tests of correlations in multi-trait multi-method matrices [Campbell and Fiske, 1959], and, indeed, the logic is quite similar.”
From a conceptual perspective, the application of the Fornell-Larcker criterion is not without limitations. For example, it is well known that variance-based SEM methods tend to overestimate indicator loadings (e.g., Hui and Wold 1982; Lohmöller 1989). The origin of this characteristic lies in the methods’ treatment of constructs. Variance-based SEM methods, such as PLS or GSCA, use composites of indicator variables as substitutes for the underlying constructs (Henseler et al. 2014). The loading of each indicator on the composite represents a relationship between the indicator and the composite of which the indicator is part. As a result, the degree of overlap between each indicator and composite will be high, yielding inflated loading estimates, especially if the number of indicators per construct (composite) is small (Aguirre-Urreta et al. 2013).^{2} Furthermore, each indicator’s error variance is also included in the composite (e.g., Bollen and Lennox 1991), which increases the validity gap between the construct and the composite (Rigdon 2014) and, ultimately, compounds the inflation in the loading estimates. Similar to the loadings, variance-based SEM methods generally underestimate structural model relationships (e.g., Reinartz et al. 2009; Marcoulides, Chin, and Saunders 2012). While these deviations are usually relatively small (i.e., less than 0.05; Reinartz et al. 2009), the interplay between inflated AVE values and deflated structural model relationships in the assessment of discriminant validity has not been systematically examined. Furthermore, the Fornell-Larcker criterion does not rely on inference statistics and, thus, no procedure for statistically testing discriminant validity has been developed to date.
Assessing cross-loadings
Another popular approach for establishing discriminant validity is the assessment of cross-loadings, which is also called “item-level discriminant validity.” According to Gefen and Straub (2005, p. 92), “discriminant validity is shown when each measurement item correlates weakly with all other constructs except for the one to which it is theoretically associated.” This approach can be traced back to exploratory factor analysis, where researchers routinely examine indicator loading patterns to identify indicators that have high loadings on the same factor and those that load highly on multiple factors (i.e., double-loaders; Mulaik 2009).
However, there has been no reflection on this approach’s usefulness in variance-based SEM. Apart from the norm that an item should be highly correlated with its own construct, but have low correlations with other constructs in order to establish discriminant validity at the item level, no additional theoretical arguments or empirical evidence of this approach’s performance have been presented. In contrast, research on covariance-based SEM has critically reflected on the approach’s usefulness for discriminant validity assessment. For example, Bollen (1989) shows that high inter-construct correlations can cause a pronounced spurious correlation between a theoretically unrelated indicator and construct. The paucity of research on the efficacy of cross-loadings in variance-based SEM is problematic, because the methods tend to overestimate indicator loadings due to their reliance on composites. At the same time, the introduction of composites as substitutes for latent variables leaves cross-loadings largely unaffected. The majority of variance-based SEM methods are limited information approaches, estimating model equations separately, so that the inflated loadings are only imperfectly introduced in the cross-loadings. Therefore, the very nature of algorithms, such as PLS, favors the support of discriminant validity as described by Barclay et al. (1995) and Chin (1998).
If ε_{jk} is explained by another variable (i.e., the correlation between the error term of an indicator and another construct is significant), we can no longer maintain the assumption that ε_{jk} is pure random error but must acknowledge that part of the measurement error is systematic error. If this systematic error is due to another construct ξ_{i}, we must conclude that the indicator does not indiscriminately measure its focal construct ξ_{j}, but also the other construct ξ_{i}, which implies a lack of discriminant validity. The lower part b) of Fig. 1 illustrates the working principle of the significance test of partial cross-loadings.
While this approach has not been applied in the context of variance-based SEM, its use is common in covariance-based SEM, where it is typically applied in the form of modification indices. Substantial modification indices point analysts to the correlations between indicator error terms and other constructs, which are nothing but partial correlations.
An initial assessment of traditional discriminant validity methods
Although the Fornell-Larcker criterion was established more than 30 years ago, there is virtually no systematic examination of its efficacy for assessing discriminant validity. Rönkkö and Evermann (2013) were the first to point out the Fornell-Larcker criterion’s potential problems. Their simulation study, which originally evaluated the performance of model validation indices in PLS, included a population model with two identical constructs. Despite the lack of discriminant validity, the Fornell-Larcker criterion indicated this problem in only 54 of the 500 cases (10.80%). This result implies that, in the vast majority of situations that lack discriminant validity, empirical researchers would mistakenly be led to believe that discriminant validity has been established. Unfortunately, Rönkkö and Evermann’s (2013) study does not permit drawing definite conclusions about extant approaches’ efficacy for assessing discriminant validity for the following reasons: First, their calculation of the AVE—a major ingredient of the Fornell-Larcker criterion—was inaccurate, because they determined one overall AVE value instead of two separate AVE values; that is, one for each construct (Henseler et al. 2014).^{5} Second, Rönkkö and Evermann (2013) did not examine the performance of the cross-loadings assessment.
Sensitivity of traditional approaches to assessing discriminant validity
Approach | GSCA | PLS | Regression with summed scales |
---|---|---|---|
Fornell-Larcker criterion | 10.66 % | 14.59 % | 7.76 % |
Cross-loadings | 8.78 % | 0.00 % | 0.03 % |
The results of this study render the following main findings: First, we can generally confirm Rönkkö and Evermann’s (2013) report on the Fornell-Larcker criterion’s extremely poor performance in PLS, even though our study’s concrete sensitivity value is somewhat higher (14.59% instead of 10.80%).^{6} In addition, we find that the sensitivity of the cross-loadings regarding assessing discriminant validity is 8.78% in respect of GSCA and, essentially, zero in respect of PLS and regression with summed scales. These results allow us to conclude that both the Fornell-Larcker criterion and the assessment of the cross-loadings are insufficiently sensitive to detect discriminant validity problems. As we will show later in the paper, this finding can be generalized to alternative model settings with different loading patterns, inter-construct correlations, and sample sizes. Second, our results are not due to a certain method’s characteristics, because we used different model estimation techniques. Although the results differ slightly across the three methods (Table 2), we find that the general pattern remains stable. In conclusion, the Fornell-Larcker criterion and the assessment of the cross-loadings fail to reliably uncover discriminant validity problems in variance-based SEM.
The heterotrait-monotrait ratio of the correlations approach to assess discriminant validity
Traditional approaches’ unacceptably low sensitivity regarding assessing discriminant validity calls for an alternative criterion. In the following, we derive such a criterion from the classical multitrait-multimethod (MTMM) matrix (Campbell and Fiske 1959), which permits a systematic discriminant validity assessment to establish construct validity. Surprisingly, the MTMM matrix approach has hardly been applied in variance-based SEM (for a notable exception see Loch et al. 2003).
The MTMM matrix analysis provides evidence of discriminant validity when the monotrait-heteromethod correlations are larger than the heterotrait-heteromethod correlations (Campbell and Fiske 1959; John and Benet-Martínez 2000). That is, the relationships of the indicators within the same construct are stronger than those of the indicators across constructs measuring different phenomena, which implies that a construct is empirically unique and a phenomenon of interest that other measures in the model do not capture.
While this rule is theoretically sound, it is problematic in empirical research practice. First, there is a large potential for ambiguities. What if the order is not as expected in only a few incidents? It cannot be ruled out that some heterotrait-heteromethod correlations exceed monotrait-heteromethod correlations, although the two constructs do in fact differ (Schmitt and Stults 1986). Second, one-by-one comparisons of values in large correlation matrices can quickly become tedious, which may be one reason for the MTMM matrix analysis not being a standard approach to assess discriminant validity in variance-based SEM.
In essence, as suggested by Nunnally (1978) and Netemeyer et al. (2003), the HTMT approach is an estimate of the correlation between the constructs ξ_{i} and ξ_{j} (see the Appendix for the derivation), which parallels the disattenuated construct score correlation. Technically, the HTMT provides two advantages over the disattenuated construct score correlation: The HTMT does not require a factor analysis to obtain factor loadings, nor does it require the calculation of construct scores. This allows for determining the HTMT even if the raw data is not available, but the correlation matrix is. Furthermore, HTMT builds on the available measures and data and—contrary to the standard MTMM approach—does not require simultaneous surveying of the same theoretical concept with alternative measurement approaches. Therefore, this approach does not suffer from the standard MTMM approach’s well-known issues regarding data requirements and parallel measures (Schmitt 1978; Schmitt and Stults 1986).
Because the HTMT is an estimate of the correlation between the constructs ξ_{i} and ξ_{j}, its interpretation is straightforward: if the indicators of two constructs ξ_{i} and ξ_{j} exhibit an HTMT value that is clearly smaller than one, the true correlation between the two constructs is most likely different from one, and they should differ. There are two ways of using the HTMT to assess discriminant validity: (1) as a criterion or (2) as a statistical test. First, using the HTMT as a criterion involves comparing it to a predefined threshold. If the value of the HTMT is higher than this threshold, one can conclude that there is a lack of discriminant validity. The exact threshold level of the HTMT is debatable; after all, “when is a correlation close to one”? Some authors suggest a threshold of 0.85 (Clark and Watson 1995; Kline 2011), whereas others propose a value of 0.90 (Gold et al. 2001; Teo et al. 2008). In the remainder of this paper, we use the notations HTMT_{.85} and HTMT_{.90} in order distinguish between these two absolute thresholds for the HTMT. Second, the HTMT can serve as the basis of a statistical discriminant validity test (which we will refer to as HTMT_{inference}). The bootstrapping procedure allows for constructing confidence intervals for the HTMT, as defined in Eq. 6, in order to test the null hypothesis (H_{0}: HTMT ≥ 1) against the alternative hypothesis (H_{1}: HTMT < 1).^{7} A confidence interval containing the value one (i.e., H_{0} holds) indicates a lack of discriminant validity. Conversely, if the value one falls outside the interval’s range, this suggests that the two constructs are empirically distinct. As Shaffer (1995, p. 575) notes, “[t]esting with confidence intervals has the advantage that they give more information by indicating the direction and something about the magnitude of the difference or, if the hypothesis is not rejected, the power of the procedure can be gauged by the width of the interval.”
In real research situations with multiple constructs, the HTMT_{inference} analysis involves the multiple testing problem (Miller 1981). Thus, researchers must control for an inflation of Type I errors resulting from applying multiple tests to pairs of constructs. That is, discriminant validity assessment using HTMT_{inference} needs to adjust the upper and lower bounds of the confidence interval in each test to maintain the familywise error rate at a predefined α level (Anderson and Gerbing 1988). We use the Bonferroni adjustment to assure that the familywise error rate of HTMT_{inference} does not exceed the predefined α level in all the (J–1) J/2 (J = number of latent variables) tests. The Bonferroni approach does not rely on any distributional assumptions about the data, making it particularly suitable in the context of variance-based SEM techniques such as PLS (Gudergan et al. 2008). Furthermore, Bonferroni is a rather conservative approach to maintain the familywise error rate at a predefined level (Hochberg 1988; Holm 1979). Its implementation therefore also renders HTMT_{inference} more conservative in terms of its sensitivity assessment (compared to other multiple testing approaches), which seems warranted given the Fornell-Larcker criterion and the cross-loadings’ poor performance in the previous simulation study.
Comparing the approaches by means of a computational experiment
Objectives
To examine the different approaches’ efficacy for establishing discriminant validity, we conduct a second Monte Carlo simulation study. The aims of this study are (1) to shed further light on the performance of the Fornell-Larcker criterion and the cross-loadings in alternative model settings and (2) to evaluate the newly proposed HTMT criteria’s efficacy for assessing discriminant validity vis-à-vis traditional approaches. We measure the approaches’ performance by means of their sensitivity and specificity (Macmillan and Creelman 2004). The sensitivity, as introduced before, quantifies each approach’s ability to detect a lack of discriminant validity if two constructs are identical. The specificity indicates how frequently an approach will signal discriminant validity if the two constructs are empirically distinct. Both sensitivity and specificity are desirable characteristics and, optimally, an approach should yield high values in both measures. In real research situations, however, it is virtually impossible to achieve perfect sensitivity and perfect specificity simultaneously due to, for example, measurement or sampling errors. Instead, approaches with a higher sensitivity will usually have a lower specificity and vice versa. Researchers thus face a trade-off between sensitivity and specificity, and need to find a find a balance between the two (Macmillan and Creelman 2004).
Experimental design and analysis
- 1.A homogenous pattern of loadings with higher AVE:$$ {\lambda}_{11}={\lambda}_{12}={\lambda}_{13}={\lambda}_{21}={\lambda}_{22}={\lambda}_{23}=.90; $$
- 2.A homogenous pattern of loadings with lower AVE:$$ {\lambda}_{11}={\lambda}_{12}={\lambda}_{13}={\lambda}_{21}={\lambda}_{22}={\lambda}_{23}=.70; $$
- 3.A more heterogeneous pattern of loadings with lower AVE:$$ {\lambda}_{11}={\lambda}_{21}=.60,{\lambda}_{12}={\lambda}_{22}=.70,{\lambda}_{13}={\lambda}_{23}=.80; $$
- 4.A more heterogeneous pattern of loadings with lower AVE:$$ {\lambda}_{11}={\lambda}_{21}=.50,{\lambda}_{12}={\lambda}_{22}=.70,{\lambda}_{13}={\lambda}_{23}=.90. $$
Next, we examine how different sample sizes—as routinely assumed in simulation studies in SEM in general (Paxton et al. 2001) and in variance-based SEM in particular (e.g., Reinartz et al. 2009; Vilares and Coelho 2013)—would influence the approaches’ efficacy. We consider sample sizes of 100, 250, 500, and 1,000.
Finally, in order to examine the sensitivity and specificity of the approaches, we vary the inter-construct correlations. First, to examine their sensitivity, we consider a situation in which the two constructs are perfectly correlated (φ = 1.0). This condition mirrors a situation in which an analyst mistakenly models two constructs, although they actually form a single construct. Optimally, all the approaches should indicate a lack of discriminant validity under this condition. Second, to examine the approaches’ specificity, we decrease the inter-construct correlations in 50 steps of 0.02 from φ = 1.00 to φ = 0.00, covering the full range of absolute correlations. The smaller the true inter-construct correlation φ, the less an approach is expected to indicate a lack of discriminant validity; that is, we anticipate that the approaches’ specificity will increase with lower levels of φ.
- 1.
The Fornell-Larcker criterion: Is the squared correlation between the two constructs greater than any of the two constructs’ AVE?
- 2.
The cross-loadings: Does any indicator correlate more strongly with the other constructs than with its own construct?
- 3.
The partial cross-loadings: Is an indicator significantly explained by a construct that it is not intended to measure when the actual construct’s influence is partialed out?
- 4.
The HTMT_{.85} criterion: Is the HTMT criterion greater than 0.85?
- 5.
The HTMT_{.90} criterion: Is the HTMT criterion greater than 0.90?
- 6.
The statistical HTMT_{inference} test: Does the 90% normal bootstrap confidence interval of the HTMT criterion with a Bonferroni adjustment include the value one?^{8}
In the simulation study, we focus on PLS, which is regarded as the “most fully developed and general system” (McDonald 1996, p. 240) of the variance-based SEM techniques. Furthermore, the initial simulation study showed that PLS is the variance-based SEM technique with the highest sensitivity (i.e., 14.59% in respect of the Fornell-Larcker criterion; Table 2). All calculations were carried out with R 3.1.0 (R Core Team 2014) and we applied PLS as implemented in the semPLS package (Monecke and Leisch 2012).
Sensitivity results
Results: Sensitivity of approaches to assess discriminant validity
Loading pattern | Sample size | Approach to assess discriminant validity | |||||
---|---|---|---|---|---|---|---|
Fornell-Larcker | Cross-loadings | Partial cross-loadings | HTMT_{.85} | HTMT_{.90} | HTMT_{inference} | ||
0.90/0.90/0.90 | 100 | 42.10 % | 0.00 % | 16.70 % | 100.00 % | 100.00 % | 96.30 % |
250 | 27.30 % | 0.00 % | 15.30 % | 100.00 % | 100.00 % | 96.00 % | |
500 | 15.40 % | 0.00 % | 17.70 % | 100.00 % | 100.00 % | 95.50 % | |
1,000 | 4.80 % | 0.00 % | 19.40 % | 100.00 % | 100.00 % | 96.00 % | |
0.70/0.70/0.70 | 100 | 6.90 % | 0.00 % | 5.10 % | 99.10 % | 95.90 % | 96.00 % |
250 | 0.30 % | 0.00 % | 5.10 % | 100.00 % | 99.90 % | 95.70 % | |
500 | 0.00 % | 0.00 % | 5.60 % | 100.00 % | 100.00 % | 94.90 % | |
1,000 | 0.00 % | 0.00 % | 6.40 % | 100.00 % | 100.00 % | 95.50 % | |
0.60/0.70/0.80 | 100 | 13.70 % | 0.00 % | 39.60 % | 99.40 % | 96.90 % | 96.60 % |
250 | 2.30 % | 0.00 % | 82.80 % | 100.00 % | 100.00 % | 96.80 % | |
500 | 0.20 % | 0.00 % | 99.50 % | 100.00 % | 100.00 % | 97.10 % | |
1,000 | 0.00 % | 0.00 % | 100.00 % | 100.00 % | 100.00 % | 98.40 % | |
0.50/0.70/0.90 | 100 | 64.60 % | 0.00 % | 99.50 % | 99.90 % | 98.50 % | 98.20 % |
250 | 59.50 % | 0.00 % | 100.00 % | 100.00 % | 100.00 % | 99.40 % | |
500 | 53.90 % | 0.00 % | 100.00 % | 100.00 % | 100.00 % | 99.80 % | |
1,000 | 42.10 % | 0.00 % | 100.00 % | 100.00 % | 100.00 % | 100.00 % | |
Average | 20.82 % | 0.00 % | 50.79 % | 99.90 % | 99.45 % | 97.01 % |
Extending our previous findings, the results clearly show that traditional approaches used to assess discriminant validity perform very poorly; this is also true in alternative model settings with different loading patterns and sample sizes. The most commonly used approach, the Fornell-Larcker criterion, fails to identify discriminant validity issues in the vast majority of cases (Table 3). It only detects a lack of discriminant validity in more than 50% of simulation runs in situations with very heterogeneous loading patterns (i.e., 0.50 /0.70 /0.90) and sample sizes of 500 or less. With respect to more homogeneous loading patterns, the Fornell-Larcker criterion yields much lower sensitivity rates, particularly when the AVE is low.
The analysis of the cross-loadings fails to identify any discriminant validity problems, as this approach yields sensitivity values of 0% across all the factor level combinations (Table 3). Hence, the comparison of cross-loadings does not provide a basis for identifying discriminant validity issues. However, the picture is somewhat different regarding the partial cross-loadings. The sensitivity remains unacceptably low in respect of homogeneous loadings patterns, no matter what the sample size is. However, the sensitivity improves substantially in respect of heterogeneous loadings patterns. The sample size clearly matters for the partial cross-loadings approach. The larger the sample size, the more sensitive the partial cross-loadings are regarding detecting a lack of discriminant validity.
In contrast to the other approaches, the two absolute HTMT_{.85} and HTMT_{.90} criteria, as well as HTMT_{inference,} yield sensitivity levels of 95% or higher under all simulation conditions (Table 3). Because of its lower threshold, HTMT_{.85} slightly outperforms the other two approaches with an average sensitivity rate of 99.90% compared to the 99.45% of HTMT_{.90} and the 97.01% of HTMT_{inference}. In general, all three HTMT approaches detect discriminant validity issues reliably.
Specificity results
All HTMT approaches show consistent patterns of decreasing specificity rates at higher levels of inter-construct correlations. As the correlations increase, the constructs’ distinctiveness decreases, making it less likely that the approaches will indicate discriminant validity. Furthermore, the three approaches show similar results patterns for different loadings, sample sizes, and inter-construct correlations, albeit at different levels. For example, ceteris paribus, when loading patterns are heterogeneous, specificity rates decrease at lower levels of inter-construct correlations compared to conditions with homogeneous loading patterns. A more detailed analysis of the results shows that all three HTMT approaches have specificity rates of well above 50% with regard to inter-construct correlations of 0.80 or less, regardless of the loading patterns and sample sizes. At inter-construct correlations of 0.70, the specificity rates are close to 100% in all instances. Thus, neither approach mistakenly indicates discriminant validity issues at levels of inter-construct correlations, which most researchers are likely to consider indicative of discriminant validity.
Comparing the approaches shows that HTMT_{.85} always exhibits higher or equal sensitivity, but lower or equal specificity values compared to HTMT_{.90}. That is, HTMT_{.85} is more likely to indicate a lack of discriminant validity, an expected finding considering the criterion’s lower threshold value. The difference between these two approaches becomes more pronounced with respect to larger sample sizes and stronger loadings, but it remains largely unaffected by the degree of heterogeneity between the loadings.
Compared to the two threshold-based HTMT approaches, HTMT_{inference} generally yields much higher specificity values, thus constituting a rather liberal approach to assessing discriminant validity, as it is more likely to indicate two constructs as distinct, even at high levels of inter-construct correlations. This finding holds especially in conditions where loadings are homogeneous and high (Fig. 5). Here, HTMT_{inference} yields specificity rates of 80% or higher in terms of inter-construct correlations as high as 0.95, which many researchers are likely to view as indicative of a lack of discriminant validity. Exceptions occur in sample sizes of 100 and with lower AVE values. Here, HTMT_{.90} achieves higher sensitivity rates compared to HTMT_{inference}. However, the differences in specificity between the two criteria are marginal in these settings.
Empirical example
Fornell-Larcker criterion results and cross loadings
ACSI | CUEX | PERQ | PERV | |
---|---|---|---|---|
Fornell-Larcker criterion | ||||
ACSI | 0.899 | |||
CUEX | 0.495 | 0.781 | ||
PERQ | 0.830 | 0.556 | 0.860 | |
PERV | 0.771 | 0.417 | 0.660 | 0.942 |
Cross-loadings | ||||
acsi1 | 0.926 | 0.489 | 0.826 | 0.757 |
acsi2 | 0.903 | 0.398 | 0.729 | 0.676 |
acsi3 | 0.867 | 0.447 | 0.672 | 0.638 |
exp1 | 0.430 | 0.845 | 0.471 | 0.372 |
exp2 | 0.429 | 0.848 | 0.474 | 0.356 |
exp3 | 0.283 | 0.629 | 0.346 | 0.229 |
qual1 | 0.802 | 0.561 | 0.916 | 0.640 |
qual2 | 0.780 | 0.486 | 0.919 | 0.619 |
qual3 | 0.515 | 0.364 | 0.731 | 0.408 |
value1 | 0.751 | 0.418 | 0.663 | 0.948 |
value2 | 0.699 | 0.364 | 0.575 | 0.935 |
Significant (p < 0.05) partial cross-loadings | ||||
acsi1 | 0.702 | n.s. | 0.178 | 0.098 |
acsi2 | 0.996 | −0.057 | −0.037 | −0.044 |
acsi3 | 1.037 | 0.060 | −0.176 | −0.071 |
exp1 | n.s. | 0.841 | −0.029 | 0.029 |
exp2 | 0.028 | 0.846 | n.s. | n.s. |
exp3 | −0.063 | 0.638 | 0.064 | −0.031 |
qual1 | 0.122 | 0.068 | 0.770 | n.s. |
qual2 | 0.058 | −0.040 | 0.891 | n.s. |
qual3 | −0.277 | −0.047 | 0.999 | n.s. |
value1 | n.s. | n.s. | 0.067 | 0.906 |
value2 | n.s. | n.s. | −0.074 | 0.982 |
Item correlation matrix
acsi1 | acsi2 | acsi3 | cuex1 | cuex2 | cuex3 | perq1 | perq2 | perq3 | perv1 | perv2 | |
---|---|---|---|---|---|---|---|---|---|---|---|
acsi1 | 1.000 | ||||||||||
acsi2 | 0.770 | 1.000 | |||||||||
acsi3 | 0.701 | 0.665 | 1.000 | ||||||||
cuex1 | 0.426 | 0.339 | 0.393 | 1.000 | |||||||
cuex2 | 0.423 | 0.345 | 0.385 | 0.574 | 1.000 | ||||||
cuex3 | 0.274 | 0.235 | 0.250 | 0.318 | 0.335 | 1.000 | |||||
perq1 | 0.797 | 0.705 | 0.651 | 0.517 | 0.472 | 0.295 | 1.000 | ||||
perq2 | 0.779 | 0.680 | 0.635 | 0.406 | 0.442 | 0.268 | 0.784 | 1.000 | |||
perq3 | 0.512 | 0.460 | 0.410 | 0.249 | 0.277 | 0.362 | 0.503 | 0.533 | 1.000 | ||
perv1 | 0.739 | 0.656 | 0.622 | 0.373 | 0.359 | 0.230 | 0.645 | 0.619 | 0.411 | 1.000 | |
perv2 | 0.684 | 0.615 | 0.579 | 0.326 | 0.310 | 0.200 | 0.556 | 0.543 | 0.354 | 0.774 | 1.000 |
HTMT results
This empirical example of the ACSI model and the use of original data illustrate a situation in which the classical criteria do not indicate any discriminant validity issues, whereas the two more conservative HTMT criteria do. While it is beyond this study’s scope to discuss the implications of the results for model design, they give rise to concern regarding the empirical distinctiveness of the ACSI and PERQ constructs.
Summary and discussion
Key findings and recommendations
Our results clearly show that the two standard approaches to assessing the discriminant validity in variance-based SEM—the Fornell-Larcker criterion and the assessment of cross-loadings—have an unacceptably low sensitivity, which means that they are largely unable to detect a lack of discriminant validity. In particular, the assessment of the cross-loadings completely fails to detect discriminant validity issues. Similarly, the assessment of partial cross-loadings—an approach which has not been used in variance-based SEM—proves inefficient in many settings commonly encountered in applied research. More precisely, the criterion only works well in situations with heterogeneous loading patterns and high sample sizes.
As a solution to this critical issue, we present a new set of criteria for discriminant validity assessment in variance-based SEM. The new HTMT criteria, which are based on a comparison of the heterotrait-heteromethod correlations and the monotrait-heteromethod correlations, identify a lack of discriminant validity effectively, as evidenced by their high sensitivity rates.
The main difference between the HTMT criteria lies in their specificity. Of the three approaches, HTMT_{.85} is the most conservative criterion, as it achieves the lowest specificity rates of all the simulation conditions. This means that HTMT_{.85} can pint to discriminant validity problems in research situations in which HTMT_{.90} and HTMT_{inference} indicate that discriminant validity has been established. In contrast, HTMT_{inference} is the most liberal of the three newly proposed approaches. Even if two constructs are highly, but not perfectly, correlated with values close to 1.0, the criterion is unlikely to indicate a lack of discriminant validity, particularly when (1) the loadings are homogeneous and high or (2) the sample size is large. Owing to its higher threshold, HTMT_{.90} always has higher specificity rates than HTMT_{.85}. Compared to HTMT_{inference}, the HTMT_{.90} criterion yields much lower specificity rates in the vast majority of conditions. We find that none of the HTMT criteria indicates discriminant validity issues for inter-construct correlations of 0.70 or less. This outcome of our specificity analysis is important, as it shows that neither approach points to discriminant validity problems at comparably low levels of inter-construct correlations.
Based on our findings, we strongly recommend drawing on the HTMT criteria for discriminant validity assessment in variance-based SEM. The actual choice of criterion depends on the model set-up and on how conservative the researcher is in his or her assessment of discriminant validity. Take, for example, the technology acceptance model and its variations (Davis 1989; Venkatesh et al. 2003), which include the constructs intention to use and the actual use. Although these constructs are conceptually different, they may be difficult to distinguish empirically in all research settings. Therefore, the choice of a more liberal HTMT criterion in terms of specificity (i.e., HTMT_{.90} or HTMT_{inference}, depending on the sample size) seems warranted. Conversely, if the strictest standards are followed, this requires HTMT_{.85} to assess discriminant validity.
Guidelines for treating discriminant validity problems
It is important to note that the elimination of items purely on statistical grounds can have adverse consequences for the construct measures’ content validity (e.g., Hair et al. 2014). Therefore, researchers should carefully scrutinize the scales (either based on prior research results, or on those from a pretest in case of the newly developed measures) and determine whether all the construct domain facets have been captured. At least two expert coders should conduct this judgment independently to ensure a high degree of objectivity (Diamantopoulos et al. 2012).
The second approach to treat discriminant validity problems aims at merging the constructs that cause the problems into a more general construct. Again, measurement theory must support this step. In this case, the more general construct replaces the problematic constructs in the model and researchers need to re-evaluate the newly generated construct’s discriminant validity with all the opposing constructs. This step may entail modifications to increase a construct’s average monotrait-heteromethod correlations and/or to decrease the average heteromethod-heterotrait correlations (Fig. 8).
Further research and concluding remarks
Our research offers several promising avenues for future research. To begin with, many researchers view variance-based SEM as the natural approach when the model includes formatively measured constructs (Chin 1998; Fornell and Bookstein 1982; Hair et al. 2012a). Obviously, the discriminant validity concept is independent of a construct’s concrete operationalization. Constructs that are conceptually different should also be empirically different, no matter how they have been measured, and no matter the types of epistemic relationships between a construct and its indicators. However, just like the Fornell-Larcker criterion and the (partial) cross-loadings, the HTMT-based criteria assume reflectively measured constructs. Applying them to formatively measured constructs is problematic, because neither the monotrait-heteromethod nor the heterotrait-heteromethod correlations of formative indicators are indicative of discriminant validity. As Diamantopoulos and Winklhofer (2001, p. 271) point out, “there is no reason that a specific pattern of signs (i.e., positive versus negative) or magnitude (i.e., high versus moderate versus low) should characterize the correlations among formative indicators.”
Prior literature gives practically no recommendations on how to assess the discriminant validity of formatively measured constructs. One of the few exceptions is the research by Klein and Rai (2009), who suggest examining the cross-loadings of formative indicators. Analogous to their reflective counterparts, formative indicators should correlate more highly with their composite construct score than with the composite score of other constructs. However, considering the poor performance of cross-loadings in our study, its use in formative measurement models appears questionable. Against this background, future research should seek alternative means to consider formatively measured constructs when assessing discriminant validity.
Apart from continuously refining, extending, and testing the HTMT-based validity assessment criteria for variance-based SEM (e.g., by evaluating their sensitivity to different base response scales, inducing variance basis differences and differential response biases), future research should also assess whether this study’s findings can be generalized to covariance-based SEM techniques, or the recently proposed consistent PLS (Dijkstra 2014; Dijkstra and Henseler 2014a, b), which mimics covariance-based SEM. Specifically, the Fornell-Larcker criterion is a standard approach to assess discriminant validity in covariance-based SEM (Shah and Goldstein 2006; Shook et al. 2004). Thus, it is necessary to evaluate whether this criterion suffers from the same limitations in a factor model setting.
In the light of the Fornell-Larcker criterion and the cross-loadings’ poor performance, researchers should carefully reconsider the results of prior variance-based SEM analyses. Failure to properly disclose discriminant validity problems may result in biased estimations of structural parameters and inappropriate conclusions about the hypothesized relationships between constructs. Revisiting the analysis results of prominent models estimated by means of variance-based SEM, such as the ACSI and the TAM, seems warranted. In doing so, researchers should analyze the different sources of discriminant validity problems and apply adequate procedures to treat them (Fig. 8).
It is important to note, however, that discriminant validity is not exclusively an empirical means to validate a model. Theoretical foundations and arguments should provide reasons for constructs correlating or not (Bollen and Lennox 1991). According to the holistic construal process (Bagozzi and Phillips 1982; Bagozzi 1984), perhaps the most influential psychometric framework for measurement development and validation (Rigdon 2012), constructs are not necessarily equivalent to the theoretical concepts at the center of scientific research: a construct should rather be viewed as “something created from the empirical data which is intended to enable empirical testing of propositions regarding the concept” (Rigdon 2014, pp. 43–344). Consequently, any derivation of HTMT thresholds is subjective. On the other hand, concepts are partly defined by their relationships with other concepts within a nomological network, a system of law-like relationships discovered over time and which anchor each concept. Therefore, hindsight failure to establish discriminant validity between two constructs does not necessarily imply that the underlying concepts are identical, especially when follow-up research provides continued support for differing relationships with the antecedent and the resultant concepts (Bagozzi and Phillips 1982). Nevertheless, our research clearly shows that future research should pay greater attention to the empirical validation of discriminant validity to ensure the rigor of theories’ empirical testing and validation.
Footnotes
- 1.
It is important to note that studies may have used different ways to assess discriminant validity assessment, but did not include these in the main texts or appendices (e.g., due to page restrictions). We would like to thank an anonymous reviewer for this remark.
- 2.
Nunnally (1978) offers an extreme example with five mutually uncorrelated indicators, implying zero loadings if all were measures of a construct. However, each indicator’s correlation (i.e., loading) with an unweighted composite of all five items is 0.45.
- 3.
Chin (2010) suggests examining the squared loadings and cross-loadings instead of the loadings and cross-loadings. He argues that, for instance, compared to a cross-loading of 0.70, a standardized loading of 0.80 may raise concerns, whereas the comparison of a shared variance of 0.64 with a shared variance of 0.49 puts matters into perspective.
- 4.
We thank an anonymous reviewer for proposing this approach.
- 5.
We thank Mikko Rönkkö and Joerg Evermann for providing us with the code of their simulation study (Rönkkö and Evermann 2013), which helped us localize this error in their analysis.
- 6.
- 7.
Strictly speaking, one should assess the absolute value of the HTMT, because a correlation of −1 implies a lack of discriminant validity, too.
- 8.
Since HTMT_{inference} relies on one-tailed tests, we use the 90% bootstrap confidence interval in order to warrant an error probability of five percent.
- 9.
An Excel sheet illustrating the computation of the HTMT values can be downloaded from http://www.pls-sem.com/jams/htmt_acsi.xlsx.
Notes
Acknowledgments
We would like to thank Theo Dijkstra, Rijksuniversiteit Groningen, The Netherlands, for his helpful comments to improve earlier versions of the manuscript. The authors contributed equally and are listed in alphabetical order. The manuscript was written when the first author was an associate professor of marketing at the Institute for Management Research, Radboud University Nijmegen, The Netherlands.
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