SSRN Author: Merlin SchaefferMerlin Schaeffer SSRN Content
http://www.ssrn.com/author=2193392
http://www.ssrn.com/rss/en-usSun, 29 Jan 2017 01:02:04 GMTeditor@ssrn.com (Editor)Sun, 29 Jan 2017 01:02:04 GMTwebmaster@ssrn.com (WebMaster)SSRN RSS Generator 1.0REVISION: The Costs of Simplicity: Why Multilevel Models May Benefit from Accounting for Cross-Cluster Differences in the Effects of ControlsContext effects, where a characteristic of an upper-level unit or cluster (e.g., a country) affects outcomes and relationships at a lower level (e.g., that of the individual), are a primary object of sociological inquiry. In recent years, sociologists have increasingly analyzed such effects using quantitative multilevel modeling. Our review of multilevel studies in leading sociology journals shows that most assume the effects of lower-level control variables to be invariant across clusters, an assumption that is often implausible. Comparing mixed effects (random intercept and slope) models, cluster-robust pooled OLS, and two-step approaches, we find that erroneously assuming invariant coefficients reduces the precision of estimated context effects. Semi-formal reasoning and Monte Carlo simulations indicate that the loss of precision is larg- est when there is pronounced cross-cluster heterogeneity in the magnitude of coefficients, when there are marked compositional differences among ...
http://www.ssrn.com/abstract=2703431
http://www.ssrn.com/1561670.htmlSat, 28 Jan 2017 10:35:36 GMT