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Dear all, I tried to use "step" function to do model selection, but I got an error massage. What I don't understand is that data as data.frame worked well for my other programs, how come I cannot make it run this time. Could you please tell me how I can fix it? ***************************************************************************************************

Dear R users, I followed the instuctions on Dr. Gelman's web to install all of documents that bugs.R needs, but when I try to run the school example that the web posted in R, I got an error: couldn't find function "bugs", what's wrong? Thanks, Jia

Dear All, When I tried to install R packages I found this error: > library(survival) Loading required package: splines > install.packages("splines") --- Please select a CRAN mirror for use in this session --- Warning message: package splines is in use and will not be installed But I just opened R, and have used anything yet, how come did it say "package splines is in

Dear all, I am wondering if there is a way to find how R defined(or wrote) the function of "coxph"? I don not mean the one that we get by checking help(coxph), but the one like coxph<-function(....){...} Thanks, Jia

Dear R users, I am doing MCMC using Metropolis-Hastings. My model is bivariate-log-normal and the prior for variance-covariance is wishart distribution. I am wondering if there are some simple codes about how to get the density of Wishart distribution in my case ? Thanks in advance. Meihua [[alternative HTML version deleted]]

Hello all, When I used commands "ecm.mix and dabipf.mix" to do a simulation (sample size is small 100), I got an error : Steps of ECM, missing value where True/False needed. I've checked the menu, and the option "prior" of ecm.mix said that if structural zeros appear in the table, hyperparameters for those cells should be set to NA. However, it didn't say how to do

Dear R users, I was trying to install "R" on an ALPHA running OSF1/V5.1 for individual use, but warning messages came out when I run "./configure" and "make". The following is part of output: % ./configure --prefix=$home/r checking build system type... alphaev67-dec-osf5.1b checking host system type... alphaev67-dec-osf5.1b loading site script

I am stuck in the installation of "R" on ALPHA runing OSF1/V5.1 for individual use. When I ran "./configure CC=cc F77=f77 Make=gmake ", the following message came out, 506426:/usr/users/1/mwang2/R/R-2.1.1/bin/exec/R: /sbin/loader: Error: libreadline.so.4: symbol "tgetflag" unresolved 506426:/usr/users/1/mwang2/R/R-2.1.1/bin/exec/R: /sbin/loader: Fatal Error: Load

Hello all, When I ran my R program in R version 2.1.1 in windows XP and 2000, and I downloaded a package call "MIX", I got an application error: RGui:Rgui.exe - Application Error: The instruction at "0x1009d8a1" referenced memory at "0xbde48f58". The memory could not be "read". Click on ok to terminate the program click on cancel to debug the program

Dear All, When I tried to install R packages I found this error: > library(survival) Loading required package: splines > install.packages("splines") --- Please select a CRAN mirror for use in this session --- Warning message: package splines is in use and will not be installed But I just opened R, and haven't used anything yet, how come did it say "package splines is

Dear all, I tried to run WinBUGS model in R by using package R2WinBUGS, but I failed because of the massage : cannot calculate DIC for model in log file of WinBUGS14. In fact, the model works in WinBUGS and I can get summaries of the model, such as density, stats..., except DIC , because DIC may not be appropriate in this kind of model due to some reasons(according to the manual of WinBUGS14),

Dear R users, I've found bugs.R : the functions for running WinBUGs from R that is writen by Dr. Andrew Gelman who is a professor from Columbia University. The bugs.R would be very useful for me, and I think many of you know it as well. I followed the instuctions on Dr. Gelman's web to install all of documents that bugs.R needs, but when I try to run the school example the web posted in

Thank you for Prof.Ripley's suggestion. I fixed the program by adding a lower scope, and the program ran, but I still got warning messages, and don't know what is going on, would this affect my results? ... Step: AIC= 12337.74 Surv(tlfup, cen) ~ MI[[j]]$trt + MI[[j]]$agem40 + MI[[j]]$agem40sq + mhtypeed1 + mhtypeed2 Df AIC <none> 12338 -

Hello all, I am trying to use stepwise procedure to select covariates in Cox model and use bootstrap to repeat stepwise selection, then record how many times variables are chosen by step() in bootstrap replications. When I use step() (or stepAIC) to do model selection, I got errors. Here is the part of my code for (j in 1:mm){ #<--mm=10 for (b in 1:nrow(reg.bs)){ #<--bootstrap 10