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st: RE: RE: Recording episodes
From
"Michael Ghebre" <[email protected]>
To
<[email protected]>
Subject
st: RE: RE: Recording episodes
Date
Thu, 7 Jul 2011 15:14:55 +0100
Thank you a lot, Nick; that is excellent stuff which helped me to sort-out
my problem!
Best
Michael A Ghebre
Research Fellow in Medical Statistics
Centre for Environmental and Preventive Medicine
Wolfson Institute of Preventive Medicine
Barts and the London School of Medicine and Dentistry
Queen Mary University of London
Charterhouse Square London EC1M 6BQ
Email : [email protected]
Tel : 02078826267
http://www.wolfson.qmul.ac.uk
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Nick Cox
Sent: 06 July 2011 18:44
To: '[email protected]'
Subject: st: RE: Recording episodes
See -tsspell- from SSC and
SJ-7-2 dm0029 . . . . . . . . . . . . . . Speaking Stata: Identifying
spells
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J.
Cox
Q2/07 SJ 7(2):249--265 (no
commands)
shows how to handle spells with complete control over
spell specification
Nick
[email protected]
Michael Ghebre
I have 1000 subjects (two treatment groups) and about 200 visits for
individual subject and recorded their diarrhea [0= no diarrhea and 1=
diarrhea].
I want to record episodes of diarrhea as 1 (episodes=1) if there is series
of diarrhea; and if there is 2 or more diarrhea-free days (diarrhea = 0)
after a diarrhea days and the next days with diarrhea (diarrhea=1), recorded
as second episode of diarrhea (episode=1). Example in the table below,
I want to write stata code which could help me recording the episodes based
on the sequence of diarrhea.
+-------------------------------------+
| subjId visit diarrhea episode |
|-------------------------------------|
1. | 1 1 0 0 |
2. | 1 2 1 1 |
3. | 1 3 1 0 |
4. | 1 4 0 0 |
5. | 1 5 0 0 |
6. | 1 6 1 1 |
7. | 1 7 1 0 |
8. | 1 8 0 0 |
9. | 1 9 1 0 |
10. | 1 10 1 0 |
11. | . . . . |
12. | . . . . |
13. | . . . . |
|-------------------------------------|
14. | 2 1 1 1 |
15. | 2 2 1 0 |
16. | 2 3 1 0 |
17. | 2 4 0 0 |
18. | 2 5 1 0 |
19. | 2 6 0 0 |
20. | 2 7 0 0 |
21. | 2 8 0 0 |
22. | 2 9 1 1 |
23. | 2 10 0 0 |
24. | 2 11 0 0 |
25. | 2 12 1 1 |
26. | 2 13 1 0 |
27. | 2 14 1 0 |
28. | 2 15 1 0 |
29. | 2 16 0 0 |
30. | . . . . |
31. | . . . . |
32. | . . . . |
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