A relative power table for nested matched case-control studies
نویسندگان
چکیده
منابع مشابه
A relative power table for nested matched case-control studies.
OBJECTIVE To calculate relative powers for nested case-control studies for different values of both relative risk and numbers of controls per case, given a fixed number of cases available for analysis. METHODS Algebraic and numerical methods. RESULTS In nested case-control studies, statistical power is a function of relative risk, rarity of exposure, number of case-control sets, and the num...
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Andersen et al. (1985, Biometrics 41, 921-932) gave an estimator of the cumulative relative mortality comparing rates of death in an epidemiologic cohort to an external population as a function of time when covariate information is available on all cohort members. We present an analogous estimator when covariate information is known only on a nested case-control sample. Counting process techniq...
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'National Cancer Institute, Biometric Research Branch, DCTD, Executive Plaza North, Room 739, 6130 Executive Boulevard, MSC 7434, Bethesda, Maryland 20892-7434, U.S.A. 2National Cancer Institute, Biometry Research Group, DCP, Executive Plaza North, Room 344, 6130 Executive Boulevard, Bethesda, Maryland 20892, U.S.A. 3F0x Chase Cancer Center, 7701 Burholme Avenue, Philadelphia, Pennsylvania 1911...
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Case-control studies occupy a central place in epidemiological research. The basic idea here is the comparison of a group (the “cases”) having the outcome of interest (normally some disease) with respect to a control group (those without disease) regarding one or more characteristics (exposure to certain external events). One of the early examples, which sparked a lot of debate in the fifties b...
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ژورنال
عنوان ژورنال: Occupational and Environmental Medicine
سال: 1999
ISSN: 1351-0711
DOI: 10.1136/oem.56.1.67