Thanks for the clarification. I should have recognized the difference between "warning" and "error." But if I may take this a step further, shouldn't it then be exact=TRUE instead of exact=NULL? Thanks, Andrew
On 8/31/07, Peter Dalgaard <[EMAIL PROTECTED]> wrote: > > Andrew Yee wrote: > > Pardon my ignorance, but is there a difference in cor.test between > > exact=FALSE and exact=NULL when method=spearman? > > > > Take for example: > > > > x<-c(1,2,2,3,4,5) > > y<-c(1,2,2,10,11,12) > > cor.test(x,y, method="spearman", exact=NULL) > > > > This gives an error message, > > Warning message: Cannot compute exact p-values with ties in: > > cor.test.default(x, y, method = "spearman", exact = NULL) > > > > However, when exact is changed to FALSE, this seems to run okay. > > > > cor.test(x,y, method="spearman", exact=FALSE) > > > > Question: should this be exact = FALSE in the documentation and/or the > code? > > > > > No. The default is indeed NULL. > > This implies that calculation of exact p-values will be attempted, and > when there are ties you get a warning (NB: not error) message. Setting > exact=FALSE, no attempt is made and no warning is given. > > Thanks, > > Andrew > > MGH Cancer Center > > > > ______________________________________________ > > 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 > > and provide commented, minimal, self-contained, reproducible code. > > > > > > -- > O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B > c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K > (*) \(*) -- University of Copenhagen Denmark Ph: (+45) > 35327918 > ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) > 35327907 > > > [[alternative HTML version deleted]]
______________________________________________ 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 and provide commented, minimal, self-contained, reproducible code.
