On Saturday 10 December 2005 17:37, Thanjavur Bragadeesh wrote: > I have two groups of patients (improved or not improved) named x and y > group respectively after being treated with 5 different drugs > > X<-c(43,52,25,48,57) and > > Y<-c(237,198,245,212,233) > > when I run > > chisq.test(cbind(x,y))
X and Y here are read as two columns of data when you use cbind with five rows. With cbind you have 4 DOF. > > I get a p value of <0.0024 > > but if I run > > chisq.test(x,y) I get a p value of 0.22 not significant at 5% When not using cbind, you have 16 DOF. The numbers may look the same to you, but you are specifying two quite different sets of data, > > > what is the difference between the two > > thanks > > bragadeesh JWDougherty ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
