Users of Bioconductor, Markus and I found a bug in the weighted version of the concordance index version in our package survcomp. A new version addressing the issue has been submitted to the development branch of bioconductor and is available from http://www.bioconductor.org/packages/devel/bioc/html/survcomp.html. If you use this function, please update the package to the latest version. Best regards, --- Benjamin Haibe-Kains Computational Biology and Functional Genomics Laboratory Center for Cancer Computational Biology Harvard School of Public Health, Dana-Farber Cancer Institute (SM824) Phone: +1 (617) 582 7267 Fax: +1 (617) 582 7760 Email: bhaibeka@jimmy.harvard.edu Webpage: http://www.hsph.harvard.edu/research/benjamin-haibe-kains/ [[alternative HTML version deleted]]