CTA vs. Non-Disentangled Omnibus Chi-Square: Comparing Samples (Not) Selected for Study Participation

Paul R. Yarnold

Optimal Data Analysis, LLC

An empirical comparison of timeline follow-back vs. averaging methods for quantifying alcohol consumption in treatment research reported non-disentangled, non-interpreted chi-square-based comparisons of factors differentiating subjects selected vs. not selected for participation in the study. CTA easily identifies underlying inter-study differences.

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