An embedded and charset-unspecified text was scrubbed... Name: not available Url: https://stat.ethz.ch/pipermail/r-help/attachments/20050808/263140da/attachment.pl
chisq.test
2 messages · Stephen Choularton, Peter Dalgaard
"Stephen Choularton" <mail at bymouth.com> writes:
Hi
I am trying to use this function. Can anyone show me how I would input
the following example?
Chi-Squared = (40-30)^2 + (20-30)^2 + (30-30)^2
30 30 30
= 3.333 + 3.333 + 0 = 6.666 (p value = 0.036)
chisq.test(c(40,30,20))
Chi-squared test for given probabilities data: c(40, 30, 20) X-squared = 6.6667, df = 2, p-value = 0.03567
I want to be able to use different denominators so can you show me how I can do it to accommodate these rather than assuming they are all the same.
No. You want to test different *hypotheses* about the distribution on the three groups. E.g. for 2:1:1 split:
chisq.test(c(40,30,20),p=c(.5,.25,.25))
Chi-squared test for given probabilities data: c(40, 30, 20) X-squared = 3.3333, df = 2, p-value = 0.1889
O__ ---- Peter Dalgaard ??ster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907