Nat. Methods 13, 603–604 (2016); published online 28 July 2016; corrected after print 16 September 2016

In the version of this article initially published, the expression defining the Fβ score was incorrect. The correct expression is Fβ = (1 + β2) (Precision × Recall)/(β2× Precision + Recall).The error has been corrected in the HTML and PDF versions of the article.