Thanks
it work perfectly.
2008/11/10 Henrique Dallazuanna <[EMAIL PROTECTED]>
> Try this:
>
> test2$a <- factor(test2$a)
>
> On Mon, Nov 10, 2008 at 10:33 AM, Ronaldo Reis-Jr. <[EMAIL PROTECTED]>wrote:
>
>> Hi,
>>
>> when I use use subset in a data.frame, all empty levels are maintained in
>> the new table.
>>
>> > test <-
>> data.frame(a=as.factor(rep(c("f1","f2","f3"),10)),b=rep(c(1,2,3),10))
>> > summary(test)
>> a b
>> f1:10 Min. :1
>> f2:10 1st Qu.:1
>> f3:10 Median :2
>> Mean :2
>> 3rd Qu.:3
>> Max. :3
>> > test2 <- subset(test,test$a=="f1")
>> > summary(test2)
>> a b
>> f1:10 Min. :1
>> f2: 0 1st Qu.:1
>> f3: 0 Median :1
>> Mean :1
>> 3rd Qu.:1
>> Max. :1
>>
>> Look that the f2 and f3 are in the new table, how to remove all empty
>> levels?
>>
>> Thanks
>> Ronaldo
>>
>> [[alternative HTML version deleted]]
>>
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>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
>
>
> --
> Henrique Dallazuanna
> Curitiba-Paraná-Brasil
> 25° 25' 40" S 49° 16' 22" O
>
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