[R] chi-squared test

juli g. pausas juli at ceam.es
Tue Dec 18 10:41:12 CET 2001

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 G. Pausas
Centro de Estudios Ambientales del Mediterraneo (CEAM)
C/ C.R. Darwin 14, Parc Tecnologic,
46980 Paterna, Valencia, SPAIN
Tel: (+ 34) 96 131 8227; Fax: (+ 34) 96 131 8190
mailto:juli at ceam.es

GCTE Fire Network - http://www.gva.es/ceam/FireNetwork

r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch

More information about the R-help mailing list