R help - Feb 2009 - What is the R equivalent of STATA's 'drop' command?

Hello,

I am trying to do some data cleaning in R. I need to drop observations that
take on certain values of a variable. In STATA I might type something like:

drop if <variable name> == 3
drop if <variable name> == 4

Is there an R equivalent of this? I have tried playing around with the
subset command, but it seems a bit clunky. What would an advanced R user's
approach be for something like this?

Thank you!


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It depends on how the data is set up (I am not an expert), but I have
had good results with the subset function.  subset(x, var!=3 & var!=4)
 this will take the subset of the dataframe x where var is not equal
to 3 or 4.

a <- rnorm(25)
var <- rep(c(1:5), 5)
x <- data.frame(a, var)
subset(x, var!=3 & var!=4)

Is this what you want?

Stephen Sefick

On Mon, Feb 9, 2009 at 7:27 PM, jjh21 <jjharden at gmail.com>
wrote:
>
> Hello,
>
> I am trying to do some data cleaning in R. I need to drop observations that
> take on certain values of a variable. In STATA I might type something like:
>
> drop if <variable name> == 3
> drop if <variable name> == 4
>
> Is there an R equivalent of this? I have tried playing around with the
> subset command, but it seems a bit clunky. What would an advanced R
user's
> approach be for something like this?
>
> Thank you!
>
>
> --
> View this message in context:
http://www.nabble.com/What-is-the-R-equivalent-of-STATA%27s-%27drop%27-command--tp21925249p21925249.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Stephen Sefick

Let's not spend our time and resources thinking about things that are
so little or so large that all they really do for us is puff us up and
make us feel like gods.  We are mammals, and have not exhausted the
annoying little problems of being mammals.

								-K. Mullis

See ?"[" and its examples

Also, section 2.7 of An Introduction to R is a good place to start:

http://cran.r-project.org/doc/manuals/R-intro.html#Index-vectors

hth,
Kingsford Jones


On Mon, Feb 9, 2009 at 5:27 PM, jjh21 <jjharden at gmail.com>
wrote:
>
> Hello,
>
> I am trying to do some data cleaning in R. I need to drop observations that
> take on certain values of a variable. In STATA I might type something like:
>
> drop if <variable name> == 3
> drop if <variable name> == 4
>
> Is there an R equivalent of this? I have tried playing around with the
> subset command, but it seems a bit clunky. What would an advanced R
user's
> approach be for something like this?
>
> Thank you!
>
>
> --
> View this message in context:
http://www.nabble.com/What-is-the-R-equivalent-of-STATA%27s-%27drop%27-command--tp21925249p21925249.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>