At 03:53 AM 10/11/2004, you wrote:
Hi,
A colleague of mine imputed data using SAS's mi command. The dataset,
containing m=5 imputations, I translated into a .dta format using
StatTransfer. I wondered if Stata's micombine command might be able to get
the regression coefficients. I created the two variables _i and _j that
normally would be present had we used Stata's mvis command instead of
SAS's mi command and ordered the dataset as mvis would have.
I still get the following error message after using micombine.
. micombine regress s_mh dum1grp dum2grp gesl lft cd4 vload, impid (_j)
no row-identifier variable found - data may have incorrect format
r(198);
What format does Stata expect? Any help to sort this out will be greatly
appreciated.
Here is an example of the format from a data set of mine that worked
without problem.
+---------------------+
| _i _j sex |
|---------------------|
1. | 1 1 Female |
2. | 1 2 Female |
3. | 1 3 Female |
4. | 1 4 Female |
5. | 1 5 Female |
|---------------------|
6. | 2 1 Female |
7. | 2 2 Female |
8. | 2 3 Female |
9. | 2 4 Female |
10. | 2 5 Female |
|---------------------|
In the final data set there are 5 combined data sets (_j) and (_j=1 to 5).
Within each data set, _i is the observation number.
Fred Wolfe
Gerben ter Riet, MD PhD, Academic Medical Center
Dept. General Practice, Room J2-118, 1105 AZ Amsterdam
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
Fred Wolfe
National Data Bank for Rheumatic Diseases
Wichita, Kansas
Tel (316) 263-2125 Fax (316) 263-0761
[email protected]
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
