1 Why is multiple testing a problem?
controlling the false discovery rate (FDR). This is de ned as the proportion of false positives among all signi cant results. The FDR works by estimating some rejection region so that, on average, FDR < . 4 The positive False Discovery Rate The positive false discovery rate (pFDR) is a bit of a wrinkle on the FDR. Here, you try to
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