Displaying 1 result from an estimated 1 matches for "tvarassign".
2004 Dec 13
3
Advice on parsing formulae
Dear list
I would like to be able to group terms in a formula using a function that I
will call tvar(), eg. the formula
Y ~ 1 + tvar(x:A) + tvar(z) + u + tvar(B) + tvar(poly(v,3))
where x,u and v are numeric and A and B are factors - binary, say.
As output, I want the model.matrix as if tvar had not been there at all. In
addition, I would like to have information on the grouping, as a vector