(A) Submodels 1.1 and 2.1 | ||||
Coefficients | ||||
 | Estimate | Standard error | t-value | p-value |
(Intercept) | 0.76 | 0.09 | 8.27 |  < 0.05 |
Academic age | 0.02 | 0.00 | 4.97 |  < 0.05 |
Residual standard error | 0.25 | Â | Â | Â |
R2 | 0.49 | Â | Â | Â |
Adjusted R2 | 0.47 | Â | Â | Â |
Degrees of freedom | 26 | Â | Â | Â |
(B) Submodel 3.1 | ||||
Coefficients | ||||
 | Estimate | Standard error | t-value | p-value |
(Intercept) | 1.38 | 0.25 | 5.45 |  < 0.05 |
Mean of international co-authors | 0.43 | 0.16 | 2.79 |  < 0.05 |
Academic age | 0.03 | 0.01 | 2.74 |  < 0.05 |
Residual standard error | 0.52 | Â | Â | Â |
R2 | 0.36 | Â | Â | Â |
Adjusted R2 | 0.31 | Â | Â | Â |
Degrees of freedom | 25 | Â | Â | Â |
(C) Submodel 4.1 | ||||
Coefficients | ||||
 | Estimate | Standard error | t-value | p-value |
(Intercept) | 1.49 | 0.27 | 5.51 |  < 0.05 |
Academic age | 0.03 | 0.01 | 2.39 |  < 0.05 |
Mean proportion of international co-authors | 1.69 | 0.94 | 1.81 | 0.08 |
Residual standard error | 0.56 | Â | Â | Â |
R2 | 0.26 | Â | Â | Â |
Adjusted R2 | 0.20 | Â | Â | Â |
Degrees of freedom | 25 | Â | Â | Â |