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Hi, The standard error from logistic regression is slightly different from the naive SE from GEE under independence working correlation structure. Shouldn't they be identical? Anyone has insight about this? Thanks, Qiong a<-rbinom(1000,1) b<-rbinom(1000,2,0.1) c<-rbinom(1000,10,0.5) summary(gee(a~b, id=c,family="binomial",corstr="independence"))$coef summary(glm(a~b,family="binomial"))

...ning message: NAs introduced by coercion However, "c" is not coded as NA. The following does not work either: > factor(x,exclude=factor("c",levels=c("a","b","c"))) [1] a b c Levels: a b c What's wrong with my codes? Thanks for any help Qiong Yang

...ack when plotting groupedData with an outer factor: For example, library(nlme) plot(Dialyzer, outer=~QB, key=F) This generated colored curves in R.2.4.1. How to make all the curves black ? (or how to alter the color (type) of lines for the nlme groupedData plotting function in general?) Thanks Qiong

Dear all, I am new to R. I wish to use R's multiple imputation to deal with missing data. I have a data set with the size around 300 observations and 150 variables. I checked the help function in R and could not locate how to write the codes for this. can anyone give a hand? Do appreciate your time and kindness! Q. [[alternative HTML version deleted]]

...()) Here is the print(m) result before this line [1] model.frame(data = data, na.action = na.omit, formula = y ~ x +z) I will appreciate anyone help me figure out why data cannot be passed to the arguments when lmekin() is wrapped into another function? And what can be done to fix it? Thanks Qiong

Hi, I'm very interested in the quality of the codes generated by LLVM. Has anyone done performance comparision among llvm, gcc, and native compilers on x86 or sparc for SPEC CPU2000 or other large benchmarks? thanks. Qiong

...--- * bisectr (0.0.2) Maintainer: Winston Chang Author(s): Winston Chang <winston at stdout.org> License: GPL-2 http://crantastic.org/packages/bisectr Tools to find bad commits with git bisect * CUMP (1.0) Maintainer: Xuan Liu Author(s): Xuan Liu <liuxuan at bu.edu> and Qiong Yang <qyang at bu.edu> License: GPL (>= 2) http://crantastic.org/packages/CUMP Combining Univariate Association Test Results of Multiple Phenotypes for Detecting Pleiotropy * cumplyr (0.1-1) Maintainer: John Myles White Author(s): John Myles White License: MIT http://cran...

...9; technique requiring no distributional assumptions on the observed data. * sensitivityPStrat (1.0) Charles Dupont http://crantastic.org/packages/sensitivityPStrat This package provides functions to perform principal stratification sensitivity analyses on datasets. * seqRFLP (1.0.0) Qiong Ding http://crantastic.org/packages/seqRFLP This package includes functions for handling DNA sequences, especially simulated RFLP and TRFLP pattern based on selected restriction enzyme and DNA sequences. * SHIP (1.0.1) Vincent Guillemot http://crantastic.org/packages/SHIP The SHIP-...