Power Calculation for Likelihood Ratio Tests in the Nested Case-control Designs with a Randomly Sampled Control Per Case
نویسندگان
چکیده
منابع مشابه
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Background Patient falls are considered a challenge to the patient’s safety in hospitals, which, in addition to increasing the length of stay and costs, may also result in severe injuries or even the death of the patient. This study aims to investigate the associations between risk factors among fallers in comparison with the control group. Methods A prospective nested...
متن کاملA 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...
متن کاملLesser Known Facts about Nested Case-Control Designs
Nested case-control designs (or equivalently, incidence density sampling designs) are are a common approach for reducing the costs the costs of exposure assessment in a prospective epidemiologic study. Exposure data are obtained from all cases and a pre-specified number of controls randomly chosen at each failure time from all subjects who had entered the study but had not failed or left it yet...
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ژورنال
عنوان ژورنال: Japanese Journal of Biometrics
سال: 2010
ISSN: 2185-6494,0918-4430
DOI: 10.5691/jjb.31.1