Poster #34 - An Effect Size for Variance Heterogeneity in Meta-Analysis

• In Event: 77.059 - MTCC Tuesday Poster Session 18
  In Poster Session: 77.059-4 - Educational Statisticians SIG Poster Session: Statistical Issues and Investigations

Abstract

The difference in two coefficients of variation is proposed as an effect size to capture variance heterogeneity for two groups across a sample of studies, and five tests of homogeneity of this effect size were studied. Capturing within-study differences in variability across a sample
of studies should enhance understanding of treatment effects estimated by traditional mean-based effect sizes by providing information about the extent to which subjects in a treatment group responded similarly across studies, relative to a control group. Monte Carlo results suggested a test due to Miller-Feltz test can be used to test homogeneity of within-study variability.

Author

• Michael R. Harwell, University of Minnesota