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What makes a helpful online review? A meta-analysis of review characteristics

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Abstract

In this study, we aim to clarify the determinants of online review helpfulness concerning review depth, extremity and timeliness. Based on a meta-analysis, we examine the effects of important characteristics of reviews employing 53 empirical studies yielding 191 effect sizes. Findings reveal that review depth has a greater impact on helpfulness than review extremity and timeliness with the exception of its sub-metric of review volume, which exerts the negative influence on review helpfulness. Specifically, readability is the most important factor in evaluating review helpfulness. Furthermore, we discuss important moderators of the relationships and find interesting insights regarding website and culture background. In accordance with the results, we propose several implications for researchers and E-business firms. Our study provides a much needed quantitative synthesis of this burgeoning stream of research.

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Notes

  1. We convert t value to the correlation coefficient effect size by using the formula suggested by Rosenthal [46]: \({\text{r}} = {\raise0.7ex\hbox{${\text{t}}$} \!\mathord{\left/ {\vphantom {{\text{t}} {\sqrt {\left( {{\text{t}}^{2} + {\text{d}}.{\text{f}}.} \right)} }}}\right.\kern-0pt} \!\lower0.7ex\hbox{${\sqrt {\left( {{\text{t}}^{2} + {\text{d}}.{\text{f}}.} \right)} }$}}\) where \({\text{t}}\) is the t-value associated with the regression parameter that captures the effect and \({\text{d}}. {\text{f}}.\) is the degree of freedom of the reported regression model; We convert \(\beta\) to coefficient effect size by using the formula suggested by Peterson and Brown [47]: \(r = 0.98\beta + 0.05\lambda\), where \(\lambda\) is a variable that equals 1 when \(\beta\) is non-negative and 0 when \(\beta\) is negative.

  2. We use the following formulae for Fisher’s Z: (1) transformation: \(z_{r} = 0.5{ \ln }\left( {{\raise0.7ex\hbox{${\left( {1 + r} \right)}$} \!\mathord{\left/ {\vphantom {{\left( {1 + r} \right)} {1 - r}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${1 - r}$}}} \right)\), (2) Weighted average: \(\overline{{z_{r} }} = {\raise0.7ex\hbox{${\sum \left( {n_{i} - 3} \right)*z_{r} }$} \!\mathord{\left/ {\vphantom {{\sum \left( {n_{i} - 3} \right)*z_{r} } {\sum \left( {n_{i} - 3} \right)}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${\sum \left( {n_{i} - 3} \right)}$}}\) and (3) back-transformation to correlation units:

    $$\bar{r} = {\raise0.7ex\hbox{${\left( {e^{{2\overline{{z_{r} }} }} - 1} \right)}$} \!\mathord{\left/ {\vphantom {{\left( {e^{{2\overline{{z_{r} }} }} - 1} \right)} {\left( {e^{{2\overline{{z_{r} }} }} + 1} \right)}}}\right.\kern-0pt} \!\lower0.7ex\hbox{${\left( {e^{{2\overline{{z_{r} }} }} + 1} \right)}$}}\;[49].$$
  3. We calculate the 95% confidence interval as: lower \(CI = \overline{{z_{r} }} - {\raise0.7ex\hbox{${1.96}$} \!\mathord{\left/ {\vphantom {{1.96} {\sqrt {\sum \left( {n_{i} - 3} \right)} }}}\right.\kern-0pt} \!\lower0.7ex\hbox{${\sqrt {\sum \left( {n_{i} - 3} \right)} }$}}\), upper \(CI = \overline{{z_{r} }} + {\raise0.7ex\hbox{${1.96}$} \!\mathord{\left/ {\vphantom {{1.96} {\sqrt {\sum \left( {n_{i} - 3} \right)} }}}\right.\kern-0pt} \!\lower0.7ex\hbox{${\sqrt {\sum \left( {n_{i} - 3} \right)} }$}}\); the variance of effect size as: \(S_{r}^{2} = {\raise0.7ex\hbox{${\sum n_{i} \left( {r_{i} - \bar{r}} \right)^{2} }$} \!\mathord{\left/ {\vphantom {{\sum n_{i} \left( {r_{i} - \bar{r}} \right)^{2} } {\sum n_{i} }}}\right.\kern-0pt} \!\lower0.7ex\hbox{${\sum n_{i} }$}}\) and variation caused by sampling error as: \(S_{e}^{2} = {\raise0.7ex\hbox{${\sum n_{i} \left( {1 - \bar{r}} \right)^{2} }$} \!\mathord{\left/ {\vphantom {{\sum n_{i} \left( {1 - \bar{r}} \right)^{2} } {\sum n_{i} }}}\right.\kern-0pt} \!\lower0.7ex\hbox{${\sum n_{i} }$}}\); Q-value is calculated as: \(Q = \sum \left( {n_{i} - 3} \right)*\left( {z_{r} - \overline{{z_{r} }} } \right)^{2}\) and the fail safe N is as: \(N = k*\left( {{\raise0.7ex\hbox{${\bar{r}}$} \!\mathord{\left/ {\vphantom {{\bar{r}} {r_{c} }}}\right.\kern-0pt} \!\lower0.7ex\hbox{${r_{c} }$}} - 1} \right)\), where \(r_{c}\) is the “just significant” level or critical effect size which usually use 0.01.

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Acknowledgements

The work described in this paper is supported by National Natural Science Foundation of China (Grant Nos. 71531001 and 71572006).

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Appendix A

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Table 6 Studies included in the meta-analysis

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Wang, Y., Wang, J. & Yao, T. What makes a helpful online review? A meta-analysis of review characteristics. Electron Commer Res 19, 257–284 (2019). https://doi.org/10.1007/s10660-018-9310-2

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