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On April 11, 2019, the What Works Clearinghouse (WWC) hosted a free webinar on the new guidelines for reviewing analyses with missing or imputed data under the WWC Standards Handbook, Version 4.0.

The webinar covered the following topics:

  • Acceptable methods for addressing missing data
  • Assessing potential bias from missing or imputed outcome data
  • Assessing baseline equivalence in studies with missing or imputed baseline data

Presenters also shared specific examples to demonstrate how WWC missing data standards have changed from Version 3.0 to Version 4.0.

This webinar is primarily intended for researchers and WWC reviewers.


  • Jessaca Spybrook, Professor of Evaluation, Measurement and Research, Western Michigan University
  • David I. Miller, Researcher, American Institutes for Research


Released: April 2019

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