model.matrix metadata

Charles C. Berry · 2014-10-17T16:43:40Z

Patrick O'Reilly gmail.com> writes: > > Hi, > > As far as I am aware, the model.matrix function does not return > perfect metadata on what each column of the model matrix "means". > > The columns are named (e.g. age:genderM), but encoding the metadata as > strings can result in ambiguity. For example, the dummy variables > created when the factors var0 = 0 and var = 00 both are named var00. > Additionally, if a level of a factor variable contains a colon, this > could

Charles C. Berry

Fri, Oct 17, 2014 9:43 AM

Patrick O'Reilly <patrick.a.oreilly <at> gmail.com> writes:

Why don't you just retain the terms.object?

i.e

my.terms <- terms( my.formula, data=my.data.frame )
my.model.matrix <- model.matrix( my.terms, data= my.data.frame )

attributes(my.terms)


See ?terms, ?terms.object, ?model.frame (which contains a terms.object)


HTH,

Chuck

model.matrix metadata

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