Hi, The Biostrings package (Bioconductor) contains a function (g.test(), not exported) that does a G-test. It was originally written by Peter Hurd. See: https://stat.ethz.ch/pipermail/r-sig-ecology/2008-July/000275.html Peter Hurd's implementation of g.test() looks very much like the implementation of stats::chisq.test(), and is clearly based on it. In particular, the 2 functions are based on the same C function, rcont2, that used to belong to the R C API. However, in recent revisions of R-devel, rcont2 was moved to the stats package and not registered as a "C callable". So it's not accessible anymore and that breaks Biostrings. Anyway, g.test() does not belong to Biostrings in the first place. So my question is: does anybody know if there is already such a function in the stats package or in a CRAN package? Sounds like it should belong to stats but I cannot find it. Thanks, H. -- Herv? Pag?s Program in Computational Biology Division of Public Health Sciences Fred Hutchinson Cancer Research Center 1100 Fairview Ave. N, M1-B514 P.O. Box 19024 Seattle, WA 98109-1024 E-mail: hpages at fhcrc.org Phone: (206) 667-5791 Fax: (206) 667-1319