[R] chi-squared test

[Oscar Rueda]

chisq.test() uses Yates correction
Use instead 
chisq.test(aa, bb,correct=F)

and you'll get the same results

Oscar 



18/12/01 10:41:12, "juli g. pausas" <juli at ceam.es> escribió:

>I don't quite understand the difference between the two methods for
>performing a chi-squared test on contingency tables:  summary(table())
>and   chisq.test()
>They may different results. E.g.:
>
>aa <- gl(2, 10)
>bb <- as.factor(c(1,2,2,2,1,2,1,2,2,2,1,2,2,2,1,1,1,2,1,1))
>aa <- c(aa, aa)
>bb <- c(bb, bb)
>table(aa, bb)
>summary(table(aa, bb))
>chisq.test(aa, bb)
>
>Could somebody give me some clues?
>Thanks in advance
>
>Juli
>
>--
>Juli G. Pausas
>Centro de Estudios Ambientales del Mediterraneo (CEAM)
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