“Heterogeneity of variance in experimental studies: A challenge to conventional interpretations”
Statistical Modeling, Causal Inference, and Social Science 2013-06-09
Summary:
Avi sent along this old paper from Bryk and Raudenbush, who write: The presence of heterogeneity of variance across groups indicates that the standard statistical model for treatment effects no longer applies. Specifically, the assumption that treatments add a constant to each subject’s development fails. An alternative model is required to represent how treatment effects [...]
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