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Re: st: data management - changing every 1st encountered of a str data content of a var
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From |
Steven Samuels <[email protected]> |
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To |
[email protected] |
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Subject |
Re: st: data management - changing every 1st encountered of a str data content of a var |
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Date |
Tue, 6 Jan 2009 21:51:55 -0500 |
I see why you thought that. BW implied that it did come in pairs.
Perhaps it should, but I'm not sure how he can know that it does.
-Steve
On Jan 6, 2009, at 9:45 PM, Ashim Kapoor wrote:
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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