[R] trend in incidence rate

[Marc Schwartz]

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