{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T08:36:26Z","timestamp":1790066186266,"version":"4.0.1"},"reference-count":18,"publisher":"Oxford University Press (OUP)","issue":"1","license":[{"start":{"date-parts":[[2002,1,1]],"date-time":"2002-01-01T00:00:00Z","timestamp":1009843200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"funder":[{"name":"National Science Council of the Republic of China"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2002,1,1]]},"abstract":"<jats:title>Summary<\/jats:title><jats:p>An estimation procedure is proposed for the Cox model in cohort studies with validation sampling, where crude covariate information is observed for the full cohort and true covariate information is collected on a validation set sampled randomly from the full cohort. The method proposed makes use of the partial information from data that are available on the entire cohort by fitting a working Cox model relating crude covariates to the failure time. The resulting estimator is consistent regardless of the specification of the working model and is asymptotically more efficient than the validation-set-only estimator. Approximate asymptotic relative efficiencies with respect to some alternative methods are derived under a simple scenario and further studied numerically. The finite sample performance is investigated and compared with alternative methods via simulation studies. A similar procedure also works for the case where the validation set is a stratified random sample from the cohort.<\/jats:p>","DOI":"10.1111\/1467-9868.00324","type":"journal-article","created":{"date-parts":[[2003,3,12]],"date-time":"2003-03-12T19:37:03Z","timestamp":1047497823000},"page":"51-62","source":"Crossref","is-referenced-by-count":30,"title":["Cox Regression in Cohort Studies with Validation Sampling"],"prefix":"10.1093","volume":"64","author":[{"given":"Yi-Hau","family":"Chen","sequence":"first","affiliation":[{"name":"Academia Sinica , Taipei , Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2002,3,12]]},"reference":[{"key":"2023040109013700700_","doi-asserted-by":"crossref","first-page":"1100","DOI":"10.1214\/aos\/1176345976","article-title":"Cox's regression model for counting processes: a large sample study","volume":"10","author":"Andersen","year":"1982","journal-title":"Ann. 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