G'day Brian,
> "BDR" == Prof Brian Ripley <[EMAIL PROTECTED]> writes:
BDR> The proposed fix regretably will not work, since one can do
BDR> things like
BDR> library(MASS)
BDR> prcomp(~ dist + dist:climb, hills)
Yes, I had the impression that this would work with the current
v
I would argue this is a bug in model.frame(), but it seems that it is
S-compatible. That is, variables excluded by - appear in the model frame
even though they do not really appear in the simplified formula. (I
suppose the rationale is that - need not always interpreted as deletion.)
The prop
Dear all,
perhaps I am using princomp.formula and prcomp.formula in a way that
is not documented to work, but then the documentation just says:
formula: a formula with no response variable.
Thus, to avoid a lot of typing, it would be nice if one could use '.'
and '-' in the formula, e.g.
