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Table 5. 
Statistical models, total sample
Model 1Model 2
(Intercept) 638.34 (17.41)*** −445.00 (131.79)*** 
SNIP 733.68 (14.55)*** 700.45 (13.84)*** 
is_hybrid 1482.00 (21.29)*** 1300.46 (21.95)*** 
SNIP × is_hybrid −497.34 (16.32)*** −476.57 (15.54)*** 
Elsevier BV  410.88 (11.80)*** 
Frontiers Media SA  256.56 (11.78)*** 
Public Library of Science (PLoS)  −109.97 (8.60)*** 
Springer Nature  221.38 (8.82)*** 
Wiley-Blackwell  138.35 (11.31)*** 
Life Sciences  195.63 (7.98)*** 
Physical Sciences  −134.56 (9.39)*** 
Social Sciences and Humanities  −313.78 (16.66)*** 
period 2006  634.73 (133.77)*** 
period 2007  696.54 (129.58)*** 
period 2008  880.87 (131.92)*** 
period 2009  792.17 (131.79)*** 
period 2010  971.46 (134.15)*** 
period 2011  827.03 (129.93)*** 
period 2012  885.90 (129.36)*** 
period 2013  873.23 (129.31)*** 
period 2014  878.92 (129.18)*** 
period 2015  1172.59 (129.19)*** 
period 2016  1194.55 (129.14)*** 
period 2017  1228.91 (129.11)*** 
country CAN  −322.81 (18.51)*** 
country CHE  −246.49 (39.83)*** 
country CZE  −335.54 (63.74)*** 
country FRA  −256.85 (18.07)*** 
country GBR  0.78 (12.13) 
country DEU  −192.64 (12.46)*** 
country ESP  −653.24 (25.86)*** 
country GRC  −440.81 (24.01)*** 
country ITA  −249.17 (65.76)*** 
country NOR  −265.86 (17.79)*** 
country SWE  −252.72 (16.47)*** 
country USA  −500.54 (33.57)*** 
R2 0.34 0.43 
Adj. R2 0.34 0.43 
Num. obs. 66858 66313 
RMSE 787.21 729.58 
Model 1Model 2
(Intercept) 638.34 (17.41)*** −445.00 (131.79)*** 
SNIP 733.68 (14.55)*** 700.45 (13.84)*** 
is_hybrid 1482.00 (21.29)*** 1300.46 (21.95)*** 
SNIP × is_hybrid −497.34 (16.32)*** −476.57 (15.54)*** 
Elsevier BV  410.88 (11.80)*** 
Frontiers Media SA  256.56 (11.78)*** 
Public Library of Science (PLoS)  −109.97 (8.60)*** 
Springer Nature  221.38 (8.82)*** 
Wiley-Blackwell  138.35 (11.31)*** 
Life Sciences  195.63 (7.98)*** 
Physical Sciences  −134.56 (9.39)*** 
Social Sciences and Humanities  −313.78 (16.66)*** 
period 2006  634.73 (133.77)*** 
period 2007  696.54 (129.58)*** 
period 2008  880.87 (131.92)*** 
period 2009  792.17 (131.79)*** 
period 2010  971.46 (134.15)*** 
period 2011  827.03 (129.93)*** 
period 2012  885.90 (129.36)*** 
period 2013  873.23 (129.31)*** 
period 2014  878.92 (129.18)*** 
period 2015  1172.59 (129.19)*** 
period 2016  1194.55 (129.14)*** 
period 2017  1228.91 (129.11)*** 
country CAN  −322.81 (18.51)*** 
country CHE  −246.49 (39.83)*** 
country CZE  −335.54 (63.74)*** 
country FRA  −256.85 (18.07)*** 
country GBR  0.78 (12.13) 
country DEU  −192.64 (12.46)*** 
country ESP  −653.24 (25.86)*** 
country GRC  −440.81 (24.01)*** 
country ITA  −249.17 (65.76)*** 
country NOR  −265.86 (17.79)*** 
country SWE  −252.72 (16.47)*** 
country USA  −500.54 (33.57)*** 
R2 0.34 0.43 
Adj. R2 0.34 0.43 
Num. obs. 66858 66313 
RMSE 787.21 729.58 

***p < 0.01, **p < 0.05, *p < 0.1.

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