\( {\beta}_P \) | \( {\beta}_S \) | Sample size | |
---|---|---|---|
(1) Pooled OLS, no covariates | 0.256 | 0.185 | 28,774 |
(0.006) | (0.011) | ||
(2) Include \( \mathit{\mathbf{x}}_{jt} \) and \( \mathit{\mathbf{w}}_{jt} \) | 0.046 | 0.015 | 20,909 |
(0.005) | (0.008) | ||
(3) No singletons | 0.045 | 0.008 | 16,620 |
(0.005) | (0.009) | ||
(4) Fixed-effects | 0.007 | −0.002 | 16,620 |
(0.003) | (0.005) | ||
(5) Balanced panel (pooled OLS) | 0.040 | 0.014 | 7,638 |
(0.008) | (0.014) | ||
(6) Balanced panel first difference | 0.010 | −0.002 | 7,638 |
(0.004) | (0.008) |