[R] save a regression model that can be used later
dwinsemius at comcast.net
Mon Nov 22 21:04:01 CET 2010
On Nov 22, 2010, at 10:02 AM, Ni, Melody Zhifang wrote:
> Hi everyone
> I have a question about how to save a regression model in R and how
> to retrieve it for making predictions in a new session.
> To be more specific, I fitted a multilevel logistic regression model
> using the lmer from the "lme4" package. I then successfully make
> predictions using fitted(mymodel).
> Since data are complex (three levels, nested, numerous categorical
> and continuous data describing types of laparoscopic surgery), the
> computer takes quite a while to fit the MLM model. I wonder whether
> it's possible to save the fitted model so that I don't have to fit
> it again for making predictions every time I start a new R session.
> I searched the mailing-list archive. Suggestions include using save
> () to save the model as "mymodel.rda" and then use load(mymodel.rda)
> into the workspace. I tried without success (in Windows), returning
> the error message: "Error in object$fitted : $ operator is invalid
> for atomic vectors"
How? ... did you "try" that is. Need code, not vague reports of failure.
> Did I do anything wrong? Any help on this topic is much appreciated
> BW, Melody
> Dr Melody Ni
> Imperial College
> Department of Surgery and Cancer
> 10th floor, QEQM Building
David Winsemius, MD
West Hartford, CT
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