Estimating effect sizes from pretest-posttest-control group designs
SB Morris�- Organizational research methods, 2008 - journals.sagepub.com
Organizational research methods, 2008•journals.sagepub.com
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.
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.
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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