On Jun 27, 2012, at 3:11 AM, ericlsh wrote: > I would like to compare the incidence rates of three groups. They are > supposed to have different risks so I would like to test whether there is a > increasing trend in the incidence rates. Does R or any packages provide a > trend test for incidence rates? I checked epiR and epitools. It seems they > do not have this function. > > Thank you for the help.
You can use ?prop.trend.test or you can also look at the ?independence_test function with 'teststat = "quad"', which is in the coin package on CRAN. Regards, Marc Schwartz ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
