Several different approaches can be used to calculate effect sizes, with the most common type ( Cohen's d ) derived from use of the pooled standard deviation (across the intervention and control groups) as the denominator in the mathematical equation.
Under which condition might you opt for an alternative calculation method such as Hedge's g or Glass's delta ?

Question

Several different approaches can be used to calculate effect sizes, with the most common type ( Cohen's d ) derived from use of the pooled standard deviation (across the intervention and control groups) as the denominator in the mathematical equation. 
 Under which condition might you opt for an alternative calculation method such as  Hedge's g  or  Glass's delta ?

Answer

When sample sizes differ between groups

Answer

When the mean difference between groups is very large

Answer

When clinical heterogeneity exists (differences in the constructs being compared)

Answer

When standard deviations differ between groups

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Several different approaches can be used to calculate effect sizes, with the mos...

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