We propose four different GMM estimators that allow almost consistent estimation of the structural parameters of panel …

We propose four different GMM estimators that allow almost consistent estimation of the structural parameters of panel …

there is time varying panel non-response. If such non-response does not affect the common-trend assumption, then OLS and FE … estimation may still be consistent, while OLS will be inconsistent. We provide simulation as well as empirical evidence for this … evidence that non‐response is not ignorable for the differences-in-differences estimation. …