Estimating Effect Sizes From Pretest-Posttest-Control Group Designs

Organizational Research Methods - Tập 11 Số 2 - Trang 364-386 - 2008
Scott B. Morris1
1Illinois Institute of Technology

Tóm tắt

Previous research has recommended several measures of effect size for studies with repeated measurements in both treatment and control groups. Three alternate effect size estimates were compared in terms of bias, precision, and robustness to heterogeneity of variance. The results favored an effect size based on the mean pre-post change in the treatment group minus the mean pre-post change in the control group, divided by the pooled pretest standard deviation.

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Tài liệu tham khảo

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