When is p-hacking detectable?
何时能够检测到 p 值操纵?AI 解读 ↓
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We show that some forms of p-hacking cannot be detected by examining the histogram of t-statistics or their p-values. Even when p-hacking is detectable, standard tests may lack power. We propose a novel test that detects every form of selective reporting that is detectable from the distribution of reported t-statistics. Our test statistic is the distance between the smoothed empirical t-curve and the set of possible honest distributions. This projection test is sharp and can only be evaded by selective reporting that also evades all other valid tests of restrictions on the t-curve. We also show how to avoid spurious rejections caused by some benign distortions in the t-curve. Applying the test to the Brodeur et al. (2020) meta-dataset, we find that the t-curves for RCTs and IVs are more distorted than could arise by chance, (de)rounding, or the Student-t approximation.