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Dear friends. This is again a very simple question, and I hope you will accept it. I have a dataset with variables in columns all with their names. Now I want to add a column indicating simply identity of patients, numbered according to row. There are 34 rows. So I did: >ID <- c(1:34) but was not allowed to >Ptt <- cbind(patients,ID) and was informed that >Error: names attribute

...rror or xstd, despite the fact that the cross-validation is set to 10-fold. I guess I just need conformation that cross-validation doesn't work with custom functions, and if someone could explain to me why that is the case it would be greatly appreciated. Thanks, Sam Stewart -- Sam Stewart, MMath Research Statistician, Diagnostic Imaging Rm 3016, 3 South Victoria Building VG Site, QEII Health Sciences Centre 1278 Tower Rd, Halifax, NS, B3H 2Y9 [[alternative HTML version deleted]]

...->F6, F2F6, NA F2<->F7, F2F7, NA F3<->F4, F3F4, NA F3<->F5, F3F5, NA F3<->F6, F3F6, NA F3<->F7, F3F7, NA F4<->F5, F4F5, NA F4<->F6, F4F6, NA F4<->F7, F4F7, NA F5<->F6, F5F6, NA F5<->F7, F5F7, NA F6<->F7, F6F7, NA -- Sam Stewart, MMath, A.Stat IDPhD Candidate (Health Informatics) Faculty of Computer Science, Dalhousie University 6050 University Ave. Halifax, NS, Canada, B3H 1W5