lrm and Rcmdr conflict about rms

[couthcommander]

Hi Miloš - I was able to take a look at this. The "Rcmdr" package changes some R options which eventually leads to the error (by renaming columns in model.matrix.default).

Under base R:

> getOption("contrasts")
        unordered           ordered 
"contr.treatment"      "contr.poly" 

With "Rcmdr" attached:

> getOption("contrasts")
[1] "contr.Treatment" "contr.poly"     

I don't use "Rcmdr" and have no idea why it's making this change (see https://github.com/cran/Rcmdr/blob/3596637878b47a86051644e54539d21d2af7c573/R/file-menu.R#L348). But if you restore the option, lrm will work as desired.

Proposed solution:

(c_opt <- getOption("contrasts"))
library(Rcmdr)
options(contrasts = c_opt)

[MilosZarkovic]

Thank you very much. Everything is now functioning correctly.
Regards,
Miloš