Thanks

it work perfectly.

2008/11/10 Henrique Dallazuanna <wwwhsd@gmail.com>

> Try this:
>
> test2$a <- factor(test2$a)
>
> On Mon, Nov 10, 2008 at 10:33 AM, Ronaldo Reis-Jr. <chrysopa@gmail.com>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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>> 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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