Correction

ECOLOGY, STATISTICS Correction for “A unifying approach for food webs, phylogeny, social networks, and statistics,” by Grace S. Chiu and Anton H. Westveld, which appeared in issue 38, September 20, 2011, of Proc Natl Acad Sci USA (108:15881–15886; first published September 6, 2011; 10.1073/pnas.1015359108). The authors note that the data for three of the eight datasets analyzed in the article (Skipwith, St. Martin, and Ythan) were incorrectly processed. As a result, Fig. 2, Table 1, and Table 2 appeared incorrectly. The corrected figure, its corrected corresponding legend, and the corrected tables appear below. These errors do not affect the conclusions of the article.