Correction

STATISTICS, GENETICS. For the article “Significance analysis of microarrays applied to the ionizing radiation response” by Virginia Goss Tusher, Robert Tibshirani, and Gilbert Chu, which appeared in number 9, April 24, 2001, of Proc. Natl. Acad. Sci. USA (98, 5116–5121; First Published April 17, 2001; 10.1073/pnas.091062498), the authors note the following: “In our discussion of the pairwise fold change method on page 5118, we cited a paper by Ly et al., crediting them for the method. We did not mean to imply that it was deficient for the analysis of their experiments. In fact, Ly et al. incorporate both pairwise fold changes and additional data from individual oligonucleotide probe hybridizations. (For a description, see ref. 1.) Such data make their method perform better than the straight pairwise fold change method. We chose not to use this additional data, because our comparison of different methods makes sense only if the methods under comparison use the same data.” 1. Lockhart, D. & Barlow, C. (2001) Nat. Rev. Neurosci. 2, 63–68.