| Sumario: | In a bid to advance the basic understanding of effect size measures, the writers consider what these measures mean, note how they differ, and propose one way of presenting outcome data for easier interpretation. They stress that effect sizes must be clearly understood because they are becoming part and parcel of the social science research enterprise. Their discussion focuses on the use of effect size measures when presenting the findings of intervention research. They contend that by reporting effect sizes, investigators can facilitate subsequent meta-analyses, help future researchers establish outcome expectations from similar research, and better grasp how a study's findings fit into existing research literature.
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