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


From   "Ashim Kapoor" <[email protected]>
To   [email protected]
Subject   Re: st: data management - changing every 1st encountered of a str data content of a var
Date   Wed, 7 Jan 2009 08:15:22 +0530

ahhhh  I see. I was thinking diathermy only occured in pairs and that
I could assume that.

Thank you,
Ashim.

On Wed, Jan 7, 2009 at 7:38 AM, Steven Samuels <[email protected]> wrote:
> 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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