Dear R-experts, While comparing groups, it is better to assess confidence intervals of those differences rather than comparing confidence intervals for each group. I am trying to calculate the CIs of the difference between the two Cramer's V and not the CI to the estimate of each group’s Cramer's V.
Here below my toy R example. There are error messages. Any help would be highly appreciated. ############################## library(questionr) library(boot) gender1<-c("M","F","F","F","M","M","F","F","F","M","M","F","M","M","F","M","M","F","M","F","F","F","M","M","M","F","F","M","M","M","F","M","F","F","F","M","M","F","M","F") color1<-c("blue","green","black","black","green","green","blue","blue","green","black","blue","green","blue","black","black","blue","green","blue","green","black","blue","blue","black","black","green","green","blue","green","black","green","blue","black","black","blue","green","green","green","blue","blue","black") gender2<-c("F","F","F","M","M","F","M","M","M","F","F","M","F","M","F","F","M","M","M","F","M","M","M","F","F","F","M","M","M","F","M","M","M","F","F","F","M","F","F","F") color2<-c("green","blue","black","blue","blue","blue","green","blue","green","black","blue","black","blue","blue","black","blue","blue","green","blue","black","blue","blue","black","black","green","blue","black","green","blue","green","black","blue","black","blue","green","blue","green","green","blue","black") f1=data.frame(gender1,color1) tab1<-table(gender1,color1) e1<-cramer.v(tab1) f2=data.frame(gender2,color2) tab2<-table(gender2,color2) e2<-cramer.v(tab2) f3<-data.frame(e1-e2) cramerdiff=function(x,w){ y<-tapply(x[w,1], x[w,2],cramer.v) y[1]-y[2] } results<-boot(data=f3,statistic=cramerdiff,R=2000) results boot.ci(results,type="all") ############################## ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.