Statalist


[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

Re: st: xtmelogit question


From   Jennifer Manuel <[email protected]>
To   [email protected]
Subject   Re: st: xtmelogit question
Date   Sun, 27 Jan 2008 11:59:19 -0500

Thank you, Maarten. No, it still doesn't converge when I leave out the cov(un) option. It converges when fitting the random-intercept model but not when introducing a random slope.

Jennifer

Maarten buis wrote:

Does it converge if you leave out the -cov(un)- option?
--Maarten

--- Jennifer Manuel <[email protected]> wrote:

I am estimating a mixed-effects logistic regression model using xtmelogit. I'm examining the impact of two case management models on medication adherence among 198 individuals who were followed over a 3-year period. In estimating the model, I am getting the message "initial values not feasible" r(1400). The output is below. I've searched the listserv and have tried to use starting values from a simpler model using the from() option, but I still get the same error
message. I would be grateful for any advice on what I'm doing wrong.

. xtmelogit nonadherencemo interval trtcond txBYintvl || id:
interval, cov(un) var

Refining starting values:

initial values not feasible
r(1400);

Thank you,
Jennifer

*
* 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/


-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


___________________________________________________________
Yahoo! Answers - Got a question? Someone out there knows the answer. Try it
now.
http://uk.answers.yahoo.com/ *
* 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/

*
*   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/



© Copyright 1996–2024 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index