[R] a statistic question about chisq.test()

Thu Mar 27 03:47:30 CET 2003

On 26 Mar 2003 at 13:35, aprilsun wrote:

First, look at the expected values under the null. If only a few are 
below 5 and all are above 1 there are probably no problem.

Second, you can use chisq.test with the argument
simulate.p.value=TRUE

Kjetil Halvorsen

> Hi, 
> In the chisq.test(), if the expected frequency for some categories is <5, there will be a warning message which says
> Warning message: 
> Chi-squared approximation may be incorrect in: chisq.test(x, p = probs)
> 
> I am wondering whether there are some methods to get rid of this mistake... Seems the ?chisq.test() doesn't provide more
> options to solve this problem. Or, the only choice is to preprocess the data to avoid this situation?
> 
> Thanks a lot!
> 
> aprilsun
> 
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