Paul R. Yarnold
Optimal Data Analysis, LLC
The effect of serum cholesterol level on coronary heart disease and mortality was assessed for middle aged diabetic men in a prospective population study.1 Logistic regression was used to test the linear trend over quintiles, yielding estimated p<0.02. However the validity of the estimated Type I error rate is called into question because the minimum expectation for chi-square was violated. UniODA was applied to these data and identified a model yielding moderate classification accuracy (ESS=29.9, exact p<0.0006), which was stable in jackknife validity analysis.