HSC jointly estimates donor weights and a treated-unit-specific smooth residual, then extrapolates the residual via a forecaster with a cross-validated tuning parameter that interpolates between differenced and raw synthetic control.
A panel data approach for program evaluation: measuring the benefits of political and economic integration of
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The Harmonic Synthetic Control Method
HSC jointly estimates donor weights and a treated-unit-specific smooth residual, then extrapolates the residual via a forecaster with a cross-validated tuning parameter that interpolates between differenced and raw synthetic control.