Table 3 Regression analysis results.
From: The inverted U-shaped relationship between knowledge diversity of researchers and societal impact
Variables | Model 1 | Model 2 | Model 3 | |||
|---|---|---|---|---|---|---|
β | SE | β | SE | β | SE | |
Control variables | ||||||
Institution count | 0.038*** | 0.009 | 0.031*** | 0.011 | 0.042*** | 0.012 |
Author count | 0.006 | 0.004 | 0.006* | 0.004 | 0.005 | 0.004 |
Journal | − 0.127 | 0.082 | − 0.134 | 0.082 | − 0.127 | 0.082 |
Time lag | 0.001*** | 0.0004 | 0.001*** | 0.0004 | 0.001*** | 0.0004 |
Fields_Physical sciences and engineering | − 0.363** | 0.154 | − 0.351** | 0.154 | − 0.356** | 0.153 |
Fields_Life and earth sciences | 0.982*** | 0.117 | 0.970*** | 0.117 | 0.949*** | 0.116 |
Fields_Biomedical and health sciences | − 0.217 | 0.135 | − 0.244* | 0.135 | − 0.245* | 0.134 |
Fields_Social sciences and humanities | 1.814*** | 0.195 | 1.814*** | 0.197 | 1.790*** | 0.198 |
Fields_Mathematics and computer science | 0.885*** | 0.334 | 0.887*** | 0.332 | 0.899*** | 0.333 |
Independent variables | ||||||
Subject count | 0.029 | 0.021 | 0.162*** | 0.042 | ||
Subject count2 | − 0.012*** | 0.003 | ||||
Constant | 4.266*** | 0.592 | 4.160*** | 0.593 | 3.798*** | 0.591 |
AIC/BIC | 5782.29/5835.68 | 5782.253/5840.98 | 5769.82/5833.89 | |||
R2 | 0.202 | 0.203 | 0.211 | |||
Root MSE | 1.578 | 1.578 | 1.571 | |||
