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利用暴露与结局替代测量设计 Logistic 回归研究AI 解读

Suppose that a binary or polytomous outcome variable is related to a possibly continuous exposure variable through a logistic regression model, and that prior to sample selection subjects can be characterized according to ‘surrogates’ for outcome and exposure. The surrogate variables are assumed to satisfy certain conditional independence properties commonly used in errors-in-variables models. This paper considers the problem of using the surrogate variables to select…

I×J×K 列联表中的交互作用检验AI 解读

Zelen (1971) proposed an asymptotic test for zero three-way interaction in the 2 × 2 × K table. This paper presents two examples for the 2 × 2 × 2 case where Zelen's test directly contradicts the data. We farther show that the correct asymptotic representation of Zelen's exact sampling distribution does, in fact, differ from his result. His test statistic will reject the null hypothesis with probability one asymptotically even under the null hypothesis, except in special…