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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