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# Re: st: how drop a block of cases based other variable values

 From Daniel Marcelino To statalist@hsphsun2.harvard.edu Subject Re: st: how drop a block of cases based other variable values Date Fri, 9 Dec 2011 10:49:42 -0500

```Thanks for help Maarten and Nick.

Daniel

On Fri, Dec 9, 2011 at 10:06 AM, Nick Cox <n.j.cox@durham.ac.uk> wrote:
> If Daniel's values for -winner- are only 1 and missing, then
>
> bysort r (winner) : drop if winner[1] == 1
>
> will be sufficient.
>
> Daniel's own code failed because the -bysort r:- makes no difference to whether -winner==1-.
>
> But -winner[1]- under -by:- is the first value of -winner- in each group.
>
> Nick
> n.j.cox@durham.ac.uk
>
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Maarten Buis
> Sent: 09 December 2011 13:53
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: how drop a block of cases based other variable values
>
> On Fri, Dec 9, 2011 at 2:45 PM, Daniel Marcelino wrote:
>> can anyone point me how can I drop all observations belonging to
>> "r" based on "winner" value? I meant, I don't wish to drop only
>> observations where winner values is 1, but
>> given I got a winner in "r==a" I want drop all observations of this group.
>
> *------------ begin example --------------
> clear
> input str2 r byte(w v1 v2 winner)
>  "a" .5 1 2  .
>  "a" .1 2 3  .
>  "a" .9 3 2  1
>  "a" .9 3 4  1
>  "a" .2 4 5  .
>  "a" .3 5 1  .
>  "b" .4 1 2  .
>  "b" .1 2 3  .
>  "b" .7 3 4  .
>  "b" .8 4 1  .
>  "b" .8 4 5  .
>  "b" .9 5 1  .
> end
>
> bys r : egen byte todrop = total(winner)
> drop if todrop
> drop todrop
> *------------- end example --------------------
>
>
> *
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> *   http://www.stata.com/help.cgi?search
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> *   http://www.ats.ucla.edu/stat/stata/

--
About me: http://danielmarcelino.zip.net/

*
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```

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