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Table 3.

Regression results (General Linear Model with Logarithm) Dependent Variable: ln(Two-year impact + 1)

Row #VariablesCoefficientsStandard deviation (article-level cluster)Standard deviation (author-level cluster)Significance
Number of authors 0.126 0.024 0.015 *** 
Year published 0.023 0.009 0.006 *** 
Month issued −0.056 0.006 0.005 *** 
Dummy variable for theoretical articles −0.484 0.062 0.044 *** 
Female −0.068 0.043 0.041   
  Dummy variables for the continent of the author’s affiliated institution 
North America 0.021 0.050 0.039   
Rest of the world −0.112 0.080 0.070   
  Dummy variables for the QS rank of the author’s affiliated institution 
Top 10 0.148 0.043 0.040 *** 
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 #VariablesCoefficientsStandard deviation (article-level cluster)Standard deviation (author-level cluster)Significance
Number of authors 0.126 0.024 0.015 *** 
Year published 0.023 0.009 0.006 *** 
Month issued −0.056 0.006 0.005 *** 
Dummy variable for theoretical articles −0.484 0.062 0.044 *** 
Female −0.068 0.043 0.041   
  Dummy variables for the continent of the author’s affiliated institution 
North America 0.021 0.050 0.039   
Rest of the world −0.112 0.080 0.070   
  Dummy variables for the QS rank of the author’s affiliated institution 
Top 10 0.148 0.043 0.040 *** 
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.

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