[R] Several factors same levels

[dereksloan]

This is probably very simple but I'm new to R so apologies for being stupid.

I have some data with No coded as 0 and yes coded as 1.

e.g. 

id sex alcohol smoker
1   M     0        1
2   F      1        0 
3   M     0        0 

I realise I can covert the numerical variable back to a factor by

falcohol<-factor(alcohol,levels=0:1)
levels<-c("No","Yes") 
fsmoker<-factor(smoker,levels=0:1)
levels<-c("No","Yes") 

but can I do this for all factors using the same levels in a single command
to make it easier (i.e. switch all 0/1, no/yes variables without having to
recode the same factor levels for them all)?

Derek

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