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Activity Number: 580 - Methodological Developments and Implications for Social Scientists
Type: Contributed
Date/Time: Wednesday, July 31, 2019 : 2:00 PM to 3:50 PM
Sponsor: Social Statistics Section
Abstract #307372 Presentation
Title: Covariate Selection in Small Randomized Studies
Author(s): David Judkins*
Companies: Abt Associates, Inc.
Keywords:
Abstract:

Considerable progress has been made in recent years in the asymptotic properties of procedures for covariate control in randomized studies. This paper focuses on the special challenges in small randomized studies. Simulation studies demonstrate that a cross-validated LASSO is an excellent choice. No selection at all results in power loss compared to no covariate adjustment at all. Stepwise procedures result lower variances but also in underestimated variances and excess type I error.


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