[R] Select only cases with negative values

[Michael Just]

Henrique,
Thanks for the rapid response. I tried the following to no avail:

> dat.lm <-lm(c~d, dat=dat, subset= d <0)
Error in eval(expr, envir, enclos) : invalid 'envir' argument
> dat.lm <-lm(c~d, dat=dat, subset= (d <0))
Error in eval(expr, envir, enclos) : invalid 'envir' argument
> dat.lm <-lm(c~d, dat=dat, subset= c(d <0))
Error in eval(expr, envir, enclos) : invalid 'envir' argument

Any other suggestions?
Thanks,
Michael Just

On Sat, Oct 18, 2008 at 5:15 PM, Henrique Dallazuanna <wwwhsd at gmail.com> wrote:
> Try this:
>
> dat.lm <-lm(c~d, subset=d < 0)
>
>
> On Sat, Oct 18, 2008 at 7:03 PM, Michael Just <mgjust at gmail.com> wrote:
>> Hello,
>> I was wondering if there was a way to only select cases my from data
>> frame that contained a negative value?
>>
>>> c<-c(1,2,3,4,5,6,7,8,9,10)
>>> d<- c(-1,2,-3,-4,5,6,-7,8,-9,10)
>>> f <- cbind(c,d)
>>> dat <-data.frame(f)
>>> dat.lm <-lm(c~d)
>>
>> If I wanted to only use the rows that had a negative value in column d
>> for my regression, how could I make that selection?
>>
>> Thanks,
>> Michael Just
>>
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>>
>
>
>
> --
> Henrique Dallazuanna
> Curitiba-Paraná-Brasil
> 25° 25' 40" S 49° 16' 22" O
>