Regression results (General Linear Model with Logarithm) Dependent Variable: ln(Two-year impact + 1)
| Row # . | Variables . | Coefficients . | Standard deviation (article-level cluster) . | Standard deviation (author-level cluster) . | Significance . |
|---|---|---|---|---|---|
| 1 | Number of authors | 0.126 | 0.024 | 0.015 | *** |
| 2 | Year published | 0.023 | 0.009 | 0.006 | *** |
| 3 | Month issued | −0.056 | 0.006 | 0.005 | *** |
| 4 | Dummy variable for theoretical articles | −0.484 | 0.062 | 0.044 | *** |
| 5 | Female | −0.068 | 0.043 | 0.041 | |
| Dummy variables for the continent of the author’s affiliated institution | |||||
| 6 | North America | 0.021 | 0.050 | 0.039 | |
| 7 | Rest of the world | −0.112 | 0.080 | 0.070 | |
| Dummy variables for the QS rank of the author’s affiliated institution | |||||
| 8 | Top 10 | 0.148 | 0.043 | 0.040 | *** |
| 9 | Ranked below 50 | −0.059 | 0.043 | 0.038 | |
| Dummy variables for the years of post-PhD experience | |||||
| 10 | Below 10 years | 0.032 | 0.040 | 0.038 | |
| 11 | More than 25 years | −0.010 | 0.055 | 0.055 | |
| 12 | PhD top 10 | 0.148 | 0.037 | 0.040 | *** |
| 13 | No PhD | −0.064 | 0.091 | 0.090 | |
| 14 | Average citations at top five journals | 0.018 | 0.003 | 0.003 | *** |
| 15 | No publications at top five journals | 0.144 | 0.053 | 0.049 | *** |
| 16 | Average publications in the last 4 years | 0.061 | 0.018 | 0.010 | *** |
| 17 | Published in the top three theoretical journals | −0.168 | 0.046 | 0.042 | *** |
| 18 | Constant | −44.1 | 17.4 | 11.4 | *** |
| 19 | R_squared | 0.248 | |||
| 20 | No. of observations | 2453 | |||
| Row # . | Variables . | Coefficients . | Standard deviation (article-level cluster) . | Standard deviation (author-level cluster) . | Significance . |
|---|---|---|---|---|---|
| 1 | Number of authors | 0.126 | 0.024 | 0.015 | *** |
| 2 | Year published | 0.023 | 0.009 | 0.006 | *** |
| 3 | Month issued | −0.056 | 0.006 | 0.005 | *** |
| 4 | Dummy variable for theoretical articles | −0.484 | 0.062 | 0.044 | *** |
| 5 | Female | −0.068 | 0.043 | 0.041 | |
| Dummy variables for the continent of the author’s affiliated institution | |||||
| 6 | North America | 0.021 | 0.050 | 0.039 | |
| 7 | Rest of the world | −0.112 | 0.080 | 0.070 | |
| Dummy variables for the QS rank of the author’s affiliated institution | |||||
| 8 | Top 10 | 0.148 | 0.043 | 0.040 | *** |
| 9 | Ranked below 50 | −0.059 | 0.043 | 0.038 | |
| Dummy variables for the years of post-PhD experience | |||||
| 10 | Below 10 years | 0.032 | 0.040 | 0.038 | |
| 11 | More than 25 years | −0.010 | 0.055 | 0.055 | |
| 12 | PhD top 10 | 0.148 | 0.037 | 0.040 | *** |
| 13 | No PhD | −0.064 | 0.091 | 0.090 | |
| 14 | Average citations at top five journals | 0.018 | 0.003 | 0.003 | *** |
| 15 | No publications at top five journals | 0.144 | 0.053 | 0.049 | *** |
| 16 | Average publications in the last 4 years | 0.061 | 0.018 | 0.010 | *** |
| 17 | Published in the top three theoretical journals | −0.168 | 0.046 | 0.042 | *** |
| 18 | Constant | −44.1 | 17.4 | 11.4 | *** |
| 19 | R_squared | 0.248 | |||
| 20 | No. of observations | 2453 | |||
Notes: (i) Base categories are excluded to avoid dummy trap. Base categories are: “Dummy variable for the continent of the affiliated institution: Europe,” “Dummy variable for the rank of the affiliated institution: Ranked between 11 and 50,” and “Post-PhD experience between 11 and 25 years”; (ii) *Significant at 10%, **Significant at 5%, ***Significant at 1%; (iii) Standard errors are clustered at the article-level and author-level. The significance levels are the same for both clusters.