Table 9. Regression analysis of the rate of pairwise collaboration between China and the United States in COVID-19 and pre-COVID-19 research.
| Independent variable | Dependent variable—China-United States Collaboration | |||||
|---|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | (5) | (6) | |
| COVID-19 | 0.014*** (0.004) | 0.069*** (0.012) | -0.060*** (0.014) | -0.055 (0.036) | 0.091*** (0.014) | 0.20*** (0.026) |
| Sample | Full | Internationally collaborative articles | Chinese authored articles | Chinese authored articles with international collaborations | United States authored articles | United States authored articles with international collaborations |
| p-value | .001 | .000 | .000 | .131 | .000 | .000 |
| N | 10,432 | 3,915 | 3,012 | 976 | 3,324 | 1,662 |
Estimates stem from linear probability models specifications with dependent variables being dummy variables taking the value of 1 if the article contains a China-United States collaboration and independent variable being COVID-19 period or pre-COVID-19. All models include controls for type of article (formal/informal). The samples for the regression in model 1 is the full sample of articles, model 2 is just the set of internationally collaborative articles, model 3 is just Chinese authored articles, 4 is just Chinese articles authored with international collaborators, model 5 if just United States authored articles and model 6 is just United States authored articles with international collaborators.
Robust standard errors in parentheses.
*, **, *** denote statistical significance at p values of 0.1, 0.05 and 0.01.