Table 2 Regression analysis results.
From: The inverted U-shaped relationship between knowledge diversity of researchers and societal impact
Variables | Model 1 | Model 2 | Model 3 | |||
|---|---|---|---|---|---|---|
M | SE | M | SE | M | SE | |
Control variables | ||||||
Institution count | 0.013** | 0.005 | 0.006 | 0.007 | 0.012* | 0.007 |
Author count | 0.005* | 0.003 | 0.006** | 0.003 | 0.004* | 0.002 |
Journal | − 0.207*** | 0.072 | − 0.214*** | 0.071 | − 0.216*** | 0.071 |
Time lag | 0.0003 | 0.0003 | 0.0003 | 0.0003 | 0.0003 | 0.0003 |
Fields_Physical sciences and engineering | − 0.584*** | 0.126 | − 0.578*** | 0.124 | − 0.583*** | 0.124 |
Fields_Life and earth sciences | 0.678*** | 0.091 | 0.655*** | 0.090 | 0.634** | 0.089 |
Fields_Biomedical and health sciences | 0.388*** | 0.111 | 0.353*** | 0.109 | 0.346*** | 0.108 |
Fields_Social sciences and humanities | 0.836*** | 0.146 | 0.838*** | 0.146 | 0.822*** | 0.146 |
Fields_Mathematics and computer science | 0.862*** | 0.323 | 0.843*** | 0.323 | 0.833*** | 0.322 |
Independent variables | ||||||
Subject count | 0.029 | 0.019 | 0.099*** | 0.031 | ||
Subject count2 | − 0.006*** | 0.002 | ||||
Constant | 4.187*** | 0.483 | 4.131*** | 0.481 | 3.958*** | 0.477 |
Wald chi2 | 267.85*** | 283.70*** | 295.44*** | |||
AIC/BIC | 18,420.86/18,479.58 | 18,418.83/18,482.89 | 18,410.12/18,479.52 | |||
Pseudo R2 | 0.024 | 0.024 | 0.025 | |||
Alpha 95%CI | [0.941, 1.086] | [0.939, 1.084] | [0.934, 1.078] | |||
