Re: st: data management - changing every 1st encountered of a str data content of a var

[Steven Samuels <sjhsamuels@earthlink.net>]

It will not uniquely identify the first occurrence there are triplets  
or longer runs. How would an analyst know there are none?
-Steve


On Jan 6, 2009, at 8:00 PM, Ashim Kapoor wrote:

> i think it does identify the first occurance,
> here is the output
>
>
>      +---------------------------------------------+
>      |                 var1                      j |
>      |---------------------------------------------|
>   1. |            monopolar              monopolar |
>   2. |              bipolar                bipolar |
>   3. |              bipolar                bipolar |
>   4. |              bipolar                bipolar |
>   5. |            monopolar              monopolar |
>      |---------------------------------------------|
>   6. |            nodiathrm              nodiathrm |
>   7. |         diathermy[2]           diathermy[1] |
>   8. |         diathermy[2]           diathermy[2] |
>   9. |              bipolar                bipolar |
>  10. |            monopolar              monopolar |
>      |---------------------------------------------|
>  11. |         diathermy[2]           diathermy[1] |
>  12. |         diathermy[2]           diathermy[2] |
>  13. |                    .                      . |
>  14. | . <- denotes missing   . <- denotes missing |
>  15. |                    .                      . |
>      |---------------------------------------------|
>  16. |            monopolar              monopolar |
>  17. |         diathermy[2]           diathermy[1] |
>  18. |         diathermy[2]           diathermy[2] |
>  19. |                    .                      . |
>  20. |                    .                      . |
>      +---------------------------------------------+
>
> no ??
>
> Thank you,
> Ashim
> On Tue, Jan 6, 2009 at 6:20 PM, Ashim Kapoor  
> <ashimkapoor@gmail.com> wrote:
> > I would do: -
> >
> > Suppose your variable is called var
> >
> >
> > gen j=var
> > replace j="diathermy[1]" if j[_n+1]=="diathermy[2]" & j=="diathermy 
> > [2]"
> > Then j would have what you want.
> >
> > I think this should do it.
> >
> > Thank you,
> > Ashim.
> >
> > ue, Jan 6, 2009 at 1:22 PM, b. water <barleywater@hotmail.com> wrote:
> > > dear all,
> > >
> > > stata 8.2 xp pro,
> > >
> > > i have a var like this:
> > >
> > > monopolar
> > > bipolar
> > > bipolar
> > > bipolar
> > > monopolar
> > > nodiathrm
> > > diathermy[2]
> > > diathermy[2]
> > > bipolar
> > > monopolar
> > > diathermy[2]
> > > diathermy[2]
> > > .
> > > . <- denotes missing
> > > .
> > > monopolar
> > > diathermy[2]
> > > diathermy[2]
> > > .
> > > .
> > >
> > > what i want to achieve is for every first encountered diathermy 
> > > [2] to be changed to diathermy[1], while leaving the second  
> > > occurence as diathermy[2]. is this possible in stata? if it can  
> > > be done, would appreciate advice/help on how to achieve it.
> > > thank you,
> > > bw
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