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Re: Re: st: keep if string for more variables


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: Re: st: keep if string for more variables
Date   Tue, 10 Dec 2013 16:26:02 +0000

No; the question is

"keep all blue data"

and the only uncertainty is whether Nick B is talking about syntax to
select variable names or syntax to select string values.

Nick
njcoxstata@gmail.com


On 10 December 2013 16:14, Sergiy Radyakin <serjradyakin@gmail.com> wrote:
> if blue01..blue10 are dummies, then to keep 'any blue' one might say:
>
> clear
> set obs 100
> forval v=1/10 {
>   generate byte blue`v'=runiform()>0.95
> }
>
> egen flag=rowtotal(blue1-blue10)
> keep if flag
> drop flag
>
> list
>
> Best, Sergiy
>
> On Tue, Dec 10, 2013 at 10:55 AM, Red Owl <rh.redowl@liu.edu> wrote:
>> My suggestion below assumed you have a single string variable named
>> color with values blue01, blue02, yell0w01, etc.
>>
>> If you have a set of binary variables for various colors, the solution
>> would be different.
>>
>>
>>
>>> Red Owl <redowl@liu> wrote:
>>>
>>> Try:
>>>
>>> keep if substr(color,1,4)== "blue"
>>>
>>> Red Owl
>>> redowl@liu.edu
>>
>>
>>>> Nick Bornschein <nick.bornschein@gmail.com> wrote:
>>
>>>> Hi,
>>>>
>>>> I have string variables, blue01 to blue10 and yellow01 to yellow10. I
>> want to keep some data by using:
>>>>
>>>>
>>>> keep if color == "blue*" to keep all blue data, but it does not work.
>> Any idea?
>>>>
>>>>
>>>> Thanks a lot
>>>> -Nick
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