Dear R-helpers,
I have a problem which I suppose is trivila, but...
I have included NA values as factors ( (to be able to make nice printed summaries with NAs % ba category ) with the following code

dat$x.f<-factor(dat$x, exclude=NULL); levels(dat$x.f)<-c("A1","A2","A3","A4","NA"); length(dat$x.f)

Now, I want to impute the missing values. Is there a nice way to drop the NA factor instead of rewriting something of the sort 
 dat$x.f<-factor(dat$x); levels(dat$x.f)<-c("A1","A2","A3","A4"); length(dat$x.f)?

Thanks 

Anne


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Anne Piotet
Tel: +41 79 359 83 32 (mobile)
Email: anne.piotet@m-td.com
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M-TD Modelling and Technology Development
PSE-C
CH-1015 Lausanne
Switzerland
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