Remove term from formula for predict.lm
This recomputes the lm but if that is ok then: mod <- lm(y1 ~ x1 + x2 + x3 + x4, anscombe) mod$call$formula <- update(as.formula(mod$call$formula), ~ . - x1 - x2) predict(eval(mod$call), list(x3 = 1, x4 = 1))
On Tue, Jan 19, 2010 at 11:10 AM, Werner W. <pensterfuzzer at yahoo.de> wrote:
Hi, probably just a quick question: can I somehow change the formula used with predict? E.g., the regression was run on "y ~ u + v + w" but for the prediction the term v should be removed from the formula contained in the regression object and only "y ~ u + w" be used. I could use model.matrix etc. to do the predictions but it would be very helpful to know a simpler way. Thanks so much, ?Werner
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