Chunk #11 — Results — Power Analysis

Source

A Long-Term Longitudinal Examination of the Effect of Early Onset of Alcohol and Drug Use on Later Alcohol Abuse.

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Text

Based on prior work within the field, it was assumed that small to medium effect sizes would be obtained. Power analyses based on a MANOVA model with a small effect size of .15 and an alpha level of .05 indicated that a sample of 177 would yield 95% power to detect a significant effect.