Full_Name: Jonathan Baron Version: 1.5.1 OS: Linux Submission from: (NULL) (151.201.155.186) The documentation of stripchart() says that "NA's are allowed in the data." I think this would imply that stripchart(nprob[cancer==4] ~ probtype[cancer==4],meth="stack") should work even if nprob has a missing datum in the relevant range. I get the following error message: Error in xy.coords(x, y) : x and y lengths differ In addition: Warning message: longer object length is not a multiple of shorter object length in: y + (unlist(xo, use.names FALSE) - 1) * offset * csize The following works. There was one missing datum. stripchart(nprob[cancer==4 & !is.na(nprob)] ~ probtype[cancer==4 & !is.na(nprob)],meth="stack") So, either the behavior or the documentation appears to need changing. I would prefer to change the behavior so it matches the documentation. Jon -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-devel-request@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._