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Pooling correlated effect sizes Notation
Achievement effect sizes and heterogeneity plots from
achievement effects adjusted means analysis of variance ANOVA Apnis Appendix BSCS Yellow calculated CFLAG CLUST coding procedures coding sheet Combining effect constructs and operations control for pre-existing control group correction factor correlated effect covariate criterion cluster criterion measure curriculum data analysis degrees of freedom dependent variable effect size estimates estimate of effect Estimating effect fixed effects model formula grade level Hedges and Olkin heterogeneity plots homogeneity statistic hypothesis ID GRP Q(I journal means and standard meta-analysis missing data open education pooled standard deviation Post-test pre-existing differences Pretest Process Skills publication bias published pupils random assignment random effects model research reports samples of subjects sampling standard errors sampling variance science curricula scores Shymansky statistical methods statistically significant strategy studies yield study characteristics study outcome subgroups sums of squares teachers theoretical treatment and control treatment group Vanek's variance component estimate variation weighted average effect