On Jun 26, 2012, at 2:27 PM, 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.
Read any introductory stats book regarding small cell sizes:
[,1] [,2] [,3] [,4]
[1,] 11 3 3 5
[2,] 3 18 6 21
--
David Winsemius, MD
West Hartford, CT
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