Millimet, Daniel L.; Bellemare, Marc F. - 2023
causal effects with nonexperimental data that are not confounded by time-invariant, unit-specific heterogeneity. One feature … of observation i ∈ {1,...,N}, the amount of unobserved heterogeneity the researcher can remove with unit fixed effects is … panel. We consider several alternatives to the fixed effects estimator with T > 2 when relevant unit-specific heterogeneity …