On 2012-06-26 11:27, Omphalodes Verna wrote:
Dear list!
I would like to calculate "chisq.test" on simple data set with 70 observations,
but the output is ''Warning message:''
Warning message:
In chisq.test(tabele) : Chi-squared approximation may be incorrect
Here is an example:
tabele<- matrix(c(11, 3, 3, 18, 3, 6, 5, 21), ncol = 4, byrow = TRUE)
dimnames(tabela)<- list(
"SEX" = c("M","F"),
"HAIR" = c("Brown", "Black", "Red", "Blonde"))
addmargins(tabele)
prop.table(tabele)
chisq.test(tabele)
Please, give me an advice / suggestion / recommendation.
Do this:
ct <- chisq.test(tabele)
ct$expected
If that does not give you a sufficient hint, then you need
to review the assumptions underlying the chisquare test.
Peter Ehlers
Thanks a lot to all, OV
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