Assessing the relative accuracies of two
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Xiao-Hua Zhou; Richard E. Higgs
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Article
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2000
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John Wiley and Sons
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English
β 109 KB
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Epidemiological studies of dementia often use two-stage designs because of the relatively low prevalence of the disease and the high cost of ascertaining a diagnosis. The ΓΏrst stage of a two-stage design assesses a large sample with a screening instrument. Then, the subjects are grouped according to