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Hi all Apologies for any cross posting. I have encountered a rather bizarre "problem" in Splus and R. I am using Age-Period-Cohort models to model cervical cancer and have run the same data on both R (v.1.4.1 & v1.6.2) and Splus (version 6.0). I used the same command line in both Splus and R: glm(cases~-1+as.factor(age) +as.factor(period)+as.factor(cohort)+offset(log(person.years)),family="poisson",data=mydata) While Splus and R fit AP...

...ervix 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 message (and any attachments) may contain confid...{{dropped}}

...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 message (and any attachments) may contain confid...{{dropped}}

...::threadMain() + 0 [0x547cbe] Thread 5e52b7c Kernel stack: 14 IOWorkLoop::threadMain() + 0 [0x547cbe] ************************************************ Emil Olsen DVM, Ph.D Student KU LIFE DK & RVC UK Supported by Faxe Animal Hospital Working title: "Diagnosing Equine Cervical Vertebral Stenosis" Frederiksberg DK & Hatfield UK +45 20921986 / +44 7503 287711 eo at life.ku.dk