if the time dimension of the panel is as small as the number of its regressors. Extensions to panels with time effects …

This paper proposes a new panel data approach to identify and estimate the time-varying average treatment effect (ATE … type of heterogeneity, existing panel data approaches identify the ATE for limited subpopulations only. In contrast, the …

Across many disciplines, the fixed effects estimator of linear panel data models is the default method to estimate … panel. We consider several alternatives to the fixed effects estimator with T > 2 when relevant unit-specific heterogeneity … results from multiple linear panel data estimators in applied research. …

The literature that tests for U-shaped relationships using panel data, such as those between pollution and income or …

to find the number of types in the data, and that allows for the estimation of panel data models. It combines machine … about the number of types. Finite mixture models are hard to estimate for panel data, which is what experiments often …

We consider a linear panel event-study design in which unobserved confounds may be related both to the outcome and to …