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. -- View this message in context: http://r.789695.n4.nabble.com/trend-in-incidence-rate-tp4634591.html Sent from the R help mailing list archive at Nabble.com.
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
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