Papers › Weighted mining of massive collections of p-values by convex optimization
Weighted mining of massive collections of p-values by convex optimization
Edgar Dobriban
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Researchers in data-rich disciplines---think of computational genomics and observational cosmology---often wish to mine large bodies of p-values looking for significant effects, while controlling the false discovery rate or family-wise error rate. Increasingly, researchers also wish to prioritize certain hypotheses, for example those thought to have larger effect sizes, by upweighting, and to impose constraints on the underlying mining, such as monotonicity along a certain sequence. We introduce Princessp, a principled method for performing weighted multiple testing by constrained convex optimization. Our method elegantly allows one to prioritize certain hypotheses through upweighting and to discount others through downweighting, while constraining the underlying weights involved in the mining process. When the p-values derive from monotone likelihood ratio families like the Gaussian means model, the new method allows exact solution of an important optimal weighting problem previously thought to be nonconvex and computationally infeasible. Our method scales to massive dataset sizes. We illustrate the applications of Princessp on a series of standard genomics datasets and offer comparisons with several previous `standard' methods. Princessp offers both ease of operation and the ability to scale to extremely large problem sizes. The method is available as open-source software from http://github.com/dobriban/pvalue_weighting_matlab .
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