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Dear R users, I was wondering if anyone knows how to obtain(subset) the first and/or the last record of a subject in a longitudinal setup. Normally in SAS one uses first.variable1 and last.variable1. So my question is that is there an R way of doing this. Regards, -- Luwis Diya, Phd student (Biostatistics), Biostatistical Center, School Of Public Health, Catholic University of Leuven, U.Z. St

Dear R users I have been encountering an error (in the Winbugs window: Blackbox - index out of range ..... ). So to me it seems R2WinBUGS is not linking up well with the new R version since the same model runs well under r-2.9.2. So is my assumption correct or am I doing something wrong. The data I used and the code are in the help of R2WinBUGS (?bugs). Regards, -- Luwis Diya, Leuven

Dear R Users, I have a question, how does one print an r function like t.test in R (to get the whole function and not just a summary of the environment)? For example if I type the following: > t.test function (x, ...) UseMethod("t.test") <environment: namespace:stats> > print(t.test) function (x, ...) UseMethod("t.test") <environment: namespace:stats> I

Dear R users, I would like to fit cross classified or multiple membership logistic models or a 3 level hierarchical logistic model using the Umacs package. Can anyone advise me on how to proceed or better point me to examples of how its done. Regards, -- Luwis Diya, Leuven Biostatistics and Statistical Bioinformatics Centre (L-BioStat), Kapucijnenvoer 35 blok d - bus 7001, 3000 Leuven,

I have been trying to write my own user defined function in Rpart.I imitated the anova splitting rule which is given as an example.In the work I am doing ,I am calculating the concentration index(ci) ,which is in between -1 and +1.So my deviance is given by abs(ci)*(1-abs(ci)).Now when I run rpart incorporating this user defined function i get the following error message: Error in

Dear R users, I am having problems in trying to run R2jags on a Linux Cluster. When I tried to run the model given in the R2jags manual I get the following error error message: Error in FUN(X[[3L]], ...) : object 'J' not found Can any one help me with this problem? Looking to hear from you all. Regards, -- Luwis Diya, Leuven Biostatistics and Statistical Bioinformatics Centre