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...mp;s\APC cervix FINAL (YG,MC,MD)\Manuscript\Data") library(Epi) source("O:\E&s\APC cervix FINAL (YG,MC,MD)\Manuscript\Programs\tt.R") cervix_all<-read.table("cervixhc.dat",header=T) Wonder whether you can help me to solve the problem? Thanks very much! Sincerely, Yanyan ====================================== Yanyan Gong, MSc Senior Research Associate Ontario Cervical Screening Program Cancer Care Ontario 620 University Ave, 11th Floor Toronto ON M5G 2L7 (416) 971-9800, ext 3304 yanyan.gong@cancercare.on.ca ====================================== This e-mail me...

...A-min(A))/5+1) where A is my age variable (numeric, the mid-point of a five-year age group), but I got the following error: Error in min(..., na.rm = na.rm) : invalid 'mode' of argument I am pretty sure I have the variable "A" in my data, can you see why this happens? Thanks. Yanyan ====================================== Yanyan Gong, MSc Senior Research Associate Ontario Cervical Screening Program Cancer Care Ontario 620 University Ave, 11th Floor Toronto ON M5G 2L7 (416) 971-9800, ext 3304 yanyan.gong@cancercare.on.ca ====================================== This e-mail m...