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Implements the "shrinkage t" statistic introduced in Opgen-Rhein and Strimmer (2007) doi:10.2202/1544-6115.1252 and a shrinkage estimate of the "correlation-adjusted t-score" (CAT score) described in Zuber and Strimmer (2009) doi:10.1093/bioinformatics/btp460. It also offers a convenient interface to a number of other regularized t-statistics commonly employed in high-dimensional case-control studies.