Table 4 Endogeneity test.
Model (1) | Model (2) | |
|---|---|---|
First stage | Second stage | |
Peer | 0.487*** (8.801) | |
Internet use | 24.568*** (3.161) | |
Control variables | YES | YES |
City dummies | YES | YES |
Year dummies | YES | YES |
F statistics | 62.002*** | |
Wald test of exogeneity (chi2) | 9.940** | |
N | 6200 | 6200 |