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Li, Wei; Konstantopoulos, Spyros – Society for Research on Educational Effectiveness, 2016
The purpose of this study is extend previous methods by Raudenbush and Liu (2001) and Spybrook et al. (2011), and provide methods for power analysis of tests of treatment effects in studies of polynomial change with two levels of nesting (e.g., students and schools) where the treatment is either at the third level (e.g., school intervention) or at…
Descriptors: Growth Models, Statistical Analysis, Change, Outcomes of Treatment