2、进行TWFE模型估计 . xtset county year panel variable: county (strongly balanced) time variable: year, 1650 to 1911 delta: 1 unit . reghdfe rebel canal_post, absorb(i.county i.year) cluster(county) (MWFE estimator convergedin2 iterations) HDFE Linear regression Number of obs = 140,432...
(MWFE estimator convergedin1 iterations) HDFE Linear regression Number of obs = 69 Absorbing 1 HDFE group F( 2, 4) = 21.65 Statistics robust to heteroskedasticity Prob > F = 0.0072 R-squared = 0.4341 Adj R-squared = 0.3793 Within R-sq. = 0.4258 Number of clusters (rep78) = 5 Root...