Explain when it is appropriate to use the standardized mean effect and when it is appropriate to use odds ratio effect size statistic.
What will be an ideal response?
The standardized mean difference effect size statistic is appropriate for representing intervention effects found on continuous outcome measures, that is, measures producing values that range over some continuum. Continuous measures include age, income, days of hospitalization, blood pressure readings, scores on achievement tests, and the like. The outcomes on such measures are typically presented in the form of mean values for the intervention and control groups, with the difference between those means indicating the size of the intervention effect. The odds ratio effect size statistic is designed to represent intervention effects on binary outcome measures; that is, measures with only two values such as arrested/not arrested, dead/alive, discharged/not discharged, success/failure, and the like. The outcomes on such measures are typically presented as the proportion of individuals in each of the two outcome categories for the intervention and control groups, respectively.
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