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An internal validation substudy compares an imperfect measurement of a variable with a gold-standard measurement in a subset of the study population. Validation data permit calculation of a bias-adjusted estimate, which has the same expected value as the association that would have been observed had the gold-standard measurement been available for the entire study population. Existing guid...... hiện toàn bộ
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Biases in Randomized TrialsEpidemiology - Tập 28 Số 1 - Trang 54-59 - 2017
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