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Difference?in?Difference Estimation by FE and OLS when there is Panel Non?Response

Author

Listed:
  • Lechner, Michael

    (University of St. Gallen)

  • Rodríguez-Planas, Núria

    (Queens College, CUNY)

  • Fernández-Kranz, Daniel

    (IE University)

Abstract

We show that the OLS and fixed-effects (FE) estimators of the popular difference-in-differences model may deviate when there is time varying panel non-response. If such non-response does not affect the common-trend assumption, then OLS and FE are consistent, but OLS is more precise. However, if non-response is affecting the common-trend assumption, then FE estimation may still be consistent, while OLS will be inconsistent. We provide simulation as well as empirical evidence for this phenomenon to occur. We conclude that in case of unbalanced panels, deviating OLS and FE estimates should be considered as evidence that non-response is not ignorable for the differences-in-differences estimation.

Suggested Citation

  • Lechner, Michael & Rodríguez-Planas, Núria & Fernández-Kranz, Daniel, 2015. "Difference?in?Difference Estimation by FE and OLS when there is Panel Non?Response," IZA Discussion Papers 9490, IZA Network @ LISER.
    • Handle: RePEc:iza:izadps:dp9490
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    References listed on IDEAS

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    JEL classification:

    • C21 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Cross-Sectional Models; Spatial Models; Treatment Effect Models
    • C31 - Mathematical and Quantitative Methods - - Multiple or Simultaneous Equation Models; Multiple Variables - - - Cross-Sectional Models; Spatial Models; Treatment Effect Models; Quantile Regressions; Social Interaction Models

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