Alternatives to polynomial trend-corrected differences-in-differences models
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DOI: 10.1080/13504851.2018.1478386
Abstract: ABSTRACT A common problem with differences-in-differences (DD) estimates is the failure of the parallel-trend assumption. To cope with this, most authors include polynomial (linear, quadratic…) trends among the regressors, and estimate the treatment effect as… read more here.
Keywords: polynomial trend; trend; treatment; alternatives polynomial ... See more keywords