Alternatively, you could simulate to approximate the reference distribution of the statistic and obtain an estimation of the p-value using:
chisq.test(matrix(c(20.1, 18.5, 2.6, 32.9, 23.5, 5.4), nc = 2), simulate.p.value = TRUE)
I hope it helps.
Best, Dimitris
p.s., you should send this message to r-help and not r-devel.
---- Dimitris Rizopoulos Ph.D. Student Biostatistical Centre School of Public Health Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/16/336899 Fax: +32/16/337015 Web: http://www.med.kuleuven.ac.be/biostat/ http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm
----- Original Message ----- From: "Benjamin Chan [BRE]" <[EMAIL PROTECTED]>
To: <r-devel@stat.math.ethz.ch>
Sent: Tuesday, April 19, 2005 10:47 AM
Subject: [Rd] chi-square test
a warning message appears when i use the chisq.test ,but it doesnt appear everytime, why? "Warning message: Chi-squared approximation may be incorrect in: chisq.test(matrix(c(20.1, 18.5, 2.6, 32.9, 23.5, 5.4), nc = 2)) "
why does the warning message appear, please? Thank you very much here is the data which I have tried appear and not appear warning message
have warning message (1.3,4.9,12.6,10.5,5.5,6.5,4.7,9.8,10.3,23.2,7.3,6.6) (13.8,8.4,8.7,10.4,25.5,28.7,2.5,5.1) (20.1,18.5,2.6,32.9,23.5,5.4)
doesnt have warning message (32.7,8.6,2561.5,2726.5) (44.4,17.4,2561.5,2726.5) (44.4,17.4,32.7,8.6) (13.9,22.3,5.1,17.4,32.3,12) (8.1,5.2,13.8,11.5,2.6,15.8,15.5,9.6,6.7,14.2) (13.9,17.4,22.3,1740,2230,1390)
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