[R] Problem with offset (Glm or glmD) in Design library

[Claus Dethlefsen / Region Nordjylland]

Dear List

My question relates to the rms (or Design) package. I have modified the example from help(Glm) to include an offset argument. It works with "glm" but "Glm" gives the error

Error in if (!length(fname) || !any(fname == zname)) { : 
  missing value where TRUE/FALSE needed


# -- begin example
library(rms)
of <- 100:92

counts <- c(18,17,15,20,10,20,25,13,12)
outcome <- gl(3,1,9)
treatment <- gl(3,3)
f <- glm(counts ~ outcome + treatment, family=poisson(),offset=of)
f
anova(f)
summary(f)
f <- Glm(counts ~ outcome + treatment, family=poisson(),offset=of)
# -- end example

The same error occurs using glmD from the Design package.

I use R version 2.11.1 for Windows and have installed the "rms" package together with Design and Hmisc. 

Is this a bug or am I missing something?

Best regards,

Claus
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Claus Dethlefsen, MSc, PhD
Biostatistician at Center for Cardiovascular Research
Aalborg Hospital, Aarhus University Hospital, Denmark