Tuesday, February 21, 2006

st: editing e(V) matrix

Dear Stata users, I have stata 8.2 for windows. I would like to edit the variance matrix e(V) after a linear regression, ereturn repost, seems to be the right command. I do not manage to use it correctly. See the log :

. capture program drop foo2; . program foo2, eclass; 1. matrix bmat = e(V); 2. matrix bmat[1,1] = 122; 3. ereturn repost V = bmat; 4. end;

. sysuse auto; (1978 Automobile Data)

. quietly regress price mpg weight; . matrix list e(V); symmetric e(V)[3,3] mpg weight _cons mpg 7422.863 weight 44.601659 .41133468 _cons -292759.82 -2191.9032 12938766

. foo2; last estimates not found

any idea why?, thank you very much for your help ! nicolas

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