Thanks to Patric and Christian for swift and accurate help I still had to learn the differnce between calling a function and passing a call to a function. I had to coerce the first variable to be a function but then it worked.
by(as.factor(exampledata$var), exampledata$interviewer, runs.test) Regards Christiaan On 14/01/2009, christiaan pauw <cjp...@gmail.com> wrote: > exampledata<-data.frame(interviewer=rep(letters[1:2], 1), > var=round(var=runif(40))) > > I do the runs test on "var" and it works > runs.test(as.factor(exampledata$var)) > I can catagorise the data by "interviewer" and get means using the by() > statement and that works perfectly > by(exampledata$var, exampledata$interviewer, mean) >> > Why is it impossible to use runs.test() as the function in the by() > statement instead of mean > by(exampledata, exampledata$interviewer, > runs.test(as.factor(exampledata$var))) > Error in FUN(X[[1L]], ...) : could not find function "FUN" > > thanks > Christiaan > ______________________________________________ R-help@r-project.org mailing list 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.
