Zeng, Donglin; Lin, D. Y. - In: Journal of the American Statistical Association 109 (2014) 505, pp. 371-383
Under two-phase cohort designs, such as case--cohort and nested case--control sampling, information on observed event times, event indicators, and inexpensive covariates is collected in the first phase, and the first-phase information is used to select subjects for measurements of expensive...