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Hi, I would like to fit a generalized linear mixed model (glmm) with a 3 level response. My data is from a longitudinal study with multiple observations/patient and multiple patients / country. Is there an R package that will fit...

Hi, I would like to repeatedly create some simulated survival data. Is there an R package that has a function that can do this? I would like to simulate a clinical trial that has 2 study arms and the outcome...

Hi, I am trying to find some information on the strata option in randomForest(). I am hoping to make predictions from some clustered data (many predictors measured repeatedly on the same subject over time). I would like to apply random...

Hi, I want to look at the relationship between 2 continuous/quantitative variables while adjusting for a third continuous variable. For example: relationship between height and weight adjusted for age. As I understand it using a glm would work if...

Hi, I am reading a "|" delimited text file into R using read.table(). I am using colClasses= to specify some variables as factors. Some of these variables include missing values coded as "NA". Unfortunately the R code I am using...

Hi, I am writing a basic function to extract the z scores for some linear regression coefficients: zscore<-function( y, x) { lm<-lm( y ~ x ) z <- coef(lm)/sqrt(diag(vcov(lm))) return(z) } I would like to pass a...

Hi, I am using caretNWS on a RHEL x86_64 system and I am getting an error message that is nearly identical to the one occuring in http://www.r-project.org/nosvn/R.check/r-release-macosx-ix86/caretNWS...

Hi, I did try the code with the na.strings option but it did not work. The factor bmicat still contains "NA" as one of its levels. Can read.table() exclude "NA" values from the variables it reads from test...

Hi All, I am in the middle of doing an analysis of a Case-Cohort design. I had three questions about the analysis: a) Does any one know of some public code for developing the patient risk sets (indexed by...

Hi Dr.Harrell, thanks for the tip but I am not sure Quantile2() does what I'm need. I need to repeatedly simulate 30 day survival data with a given sample size and estimate a hazard ratio for each simulated...

Hi Gabor, in your example X is not a factor, I don't know if this matters. > x <- head(letters) > is.factor(x) [1] FALSE Here is an example of my problem: The file C://test.txt contains id|bmicat...

Hi, I am having problems passing arguments to method="gbm" using the train() function. I would like to train gbm using the laplace distribution or the quantile distribution. here is the code I used and the error: gbm.test <- train...

Hi, I am trying to update my version of R on Centos 4. $uname -a Linux 2.6.9-78.0.5.ELsmp #1 SMP Wed Oct 8 07:06:30 EDT 2008 x86_64 x86_64 x86_64 GNU...

Hi Pat, thank you for the response. Yes I am running R on the same machine as the NWS server. I was doing this on my Windows 2003 server with out any problem. My Linux server has 4 cores and...

Hi Marc + Gustavo, thank you for the help. Marc - I tried to install the xdg-utils RPM from a different web site ( I can not find it anymore) and yum complained about a missing public key. I never could find...