Statistical evidence of a significant difference between the performance of a protected group and the majority on a preemployment exam is often critical when a court decides whether the exam has a disparate impact, that is, whether the exam has a disproportionate adverse impact on minority...

We will show that the regression approach to estimating the standard error of the Gini index can produce incorrect results as it does not account for the correlations introduced in the error terms once the data are ordered. To assess the effect of ignoring the correlation in the error terms we...

Case-control association studies using unrelated cases and controls may suffer from potential confounding due to population stratification. Bias and variance distortion caused by population stratification in the commonly used allele-based tests can considerably inflate the Type I error rate. It...

This note develops modifications of the chi-square and maximum likelihood tests for the homogeneity of the success probabilities pi of k binomial variables when the number of trials, ni, vary widely and all pi are small. With N = [Sigma]ni, and letting the ni/N approach fixed fractions, [gamma]i...