The Department of Educational Psychology joins the University of Iowa, University of Nebraska-Lincoln and University of Alberta to host an online symposium series during the 2015-16 academic year to address advanced measurement and research methods in education.

The first symposium in the series will be presented by Ariel M. Aloe at the University of Iowa on November 13th, discussing Meta-Analysis: Assessing Homogeneity between Study Variances in Categorical Models of Effects Sizes.

Abstract: Hedges discussed the rationale for fitting categorical models to effect sizes in meta-analysis. Under mixed-effect meta-analytic models, when conducting meta-regression, the assumption is that the between-studies variance is constant.  However, one can opt for a likelihood function that computes a between-studies variance within each factor level. Typically, the decision on which specification to adopt has been made on a theoretical basis or by ad-hoc comparisons of within group variation.  The presenter will consider the likelihood ratio test of the null hypothesis that residual variances are equal.

Each university will host and present on a topic throughout the academic year as it relates to educational research methods. To learn more about this series, go to the CEHD event listing.