[R] can predict ignore rows with insufficient info

Peter Whiting pete at sprint.net
Tue Sep 16 21:15:34 CEST 2003

On Tue, Sep 16, 2003 at 11:44:02AM -0500, Peter Whiting wrote:
> I'm not sure how to identify the cities in nconst that are not
> modeled by g (my actual model has many more predictors in the
> formula)

I guess I could use some form of
over and over again for each factor...

as usual, there has to be a better way.


> Is there a way to instruct predict to only predict the
> rows for which it has enough information and not complain about
> the others?
> g<-lm(days~city,data=const)
> x<-predict(g,nconst) ## the rows of x with city=ALBANY will be NA
> g<-lm(days~state,data=const)
> y<-predict(g,nconst)
> x[is.na(x)]<-y[is.na(x)]
> thanks,
> pete
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