Hi,
I recently ran into an inconsistency in the way model.matrix.default
handles factor encoding for higher level interactions with categorical
variables when the full hierarchy of effects is not present. Depending on
which lower level interactions are specified, the factor encoding changes
for a
OK. We have now three suggestions to repair the text:
- remove the text
- add "not" at the beginning of the text
- add at the end of the text a warning; something like:
"Note that in this case the standard estimates of the parameters are
in general not correct, and hence also the t values an
