Re: st: keep if string for more variables

[Nick Bornschein <nick.bornschein@gmail.com>]

Sorry for the misleading details:

I have one string variable (question) with string information like 
blue01 blue02 yellow01 and so on. So that's why I tried to use
keep if question == "blue*"

which did not work.

-Nick



Am 10.12.13 17:26, schrieb Nick Cox:
> 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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