作者：Lin, HQ; Turnbull, BW; McCulloch, CE; Slate, EH
作者单位：Yale University; Cornell University; University of California System; University of California San Francisco; Medical University of South Carolina
摘要：A retrospective substudy of the nutritional prevention of cancer (NPC) trials investigated the utility of longitudinally measured prostate-specific antigen (PSA) as a biomarker for subsequent onset of prostate cancer (PCa). Serial PSA levels were determined retrospectively from frozen blood samples that had been collected from all patients at successive clinic visits with the timing and the number of these visits highly variable. Diagnosis dates of all incident cases of PCa were recorded. Hete...
作者：Sitter, RR; Wu, CB
作者单位：Simon Fraser University; University of Waterloo
摘要：By viewing quadratic and other second-order finite population functions as totals or means over a derived synthetic finite population, we show that the recently proposed model calibration and pseudoempirical likelihood methods for effective use of auxiliary information from survey data can be readily extended to obtain efficient estimators of quadratic and other second-order finite population functions. In particular, estimation of a finite population variance, covariance, or variance of a lin...
