Citation counts have long been considered as the primary bibliographic indicator for evaluating the quality of research—a practice premised on the assumption that citation count is reflective of the impact of a scientific publication. However, identifying several limitations in the use of citation counts alone, scholars have advanced the need for multifaceted quality evaluation methods. In this study, we apply a novelty indicator to quantify the degree of citation similarity between a focal paper and a pre-existing same-domain paper from various fields in the natural sciences by proposing a new way of identifying papers that fall into the same domain of focal papers using bibliometric data only. We also conduct a validation analysis, using Japanese survey data, to confirm its usefulness. Employing ordered logit and ordinary least squares regression models, this study tests the consistency between the novelty scores of 1871 Japanese papers published in the natural sciences between 2001 and 2006 and researchers’ subjective judgments of their novelty. The results show statistically positive correlations between novelty scores and researchers’ assessment of research types reflecting aspects of novelty in various natural science fields. As such, this study demonstrates that the proposed novelty indicator is a suitable means of identifying the novelty of various types of natural scientific research.
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The journal field refers the 22 scientific fields in the Essential Science Indicators (ESI) of Thomson Reuters.
The reclassification procedures of multidisciplinary field papers were as follows: (i) collecting the references of a focal paper in the multidisciplinary field; (ii) identifying the scientific field of each reference, where a field was identified based on the scientific fields of a journal; (iii) finding the most frequent scientific field in the references of the focal paper, except for multidisciplinary fields; and (iv) using the most frequent scientific field as the scientific field of the focal paper.
These correspond to focal papers without reference papers or having no same-domain papers. For these focal papers, the novelty scores are not calculable or become zero (the latter case is rare in our study; there are only two observations).
As shown in Tables 2 and 3, our novelty scores are close to 1 and their variances are small. Previous research indicators (i.e., those used by Dahlin and Behrens (2005) and Trapido (2015)), which are the basis of our indicators, also have similar features. The small variation in the scores may make it difficult to interpret whether novelty is high or low, especially for the practical use of the indicators. On this point, applying methods such as standardization would help interpret the indicators. Figure 2 is one such example where we adopted percentile representation for the horizontal axis.
This tendency is also confirmed in the other citation windows.
The ordered logit and OLS regression models use the same dependent and independent variables with robust standard errors.
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We wish to thank Natsuo Onodera for his invaluable insights regarding the measuring of the novelty score.
Conflict of interest
The authors have no conflicts of interest to declare that are relevant to the content of this article.
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Matsumoto, K., Shibayama, S., Kang, B. et al. Introducing a novelty indicator for scientific research: validating the knowledge-based combinatorial approach. Scientometrics 126, 6891–6915 (2021). https://doi.org/10.1007/s11192-021-04049-z