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


From   Steven Samuels <[email protected]>
To   [email protected]
Subject   Re: st: data management - changing every 1st encountered of a str data content of a var
Date   Tue, 6 Jan 2009 21:08:30 -0500

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 <[email protected]> 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 <[email protected]> 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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