Researchers are often interested in the relationship between two variables, with no single data set containing both. A common strategy is to use proxies for dependent variable that surveys impute into independent variable. We show commonly employed regression or matching-based imputation procedures lead inconsistent estimates. offer a consistent and easily-implemented two-step estimator, “re-sc...

Regression models are introduced into the receiver operating characteristic (ROC) analysis to accommodate effects of covariates, such as genes. If many covariates are available, the variable selection issue arises. The traditional induced methodology separately models outcomes of diseased and nondiseased groups; thus, separate application of variable selections to two models will bring barriers...