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st: re: nlogitrum

From   "Flora Au" <>
Subject   st: re: nlogitrum
Date   Thu, 5 May 2005 09:14:28 -0600 (MDT)


I am having problem with NLOGITRUM.

This the the command I am using to run the model:

nlogitgen branch = alt(package:1|2, nopack:3)
nlogittree alt branch
nlogitrum pref nurse nsq na2 na3 n_nt1st n_highedu homevis visitsq va2 va3
 hv_nt1st hv_highedu nhv homehelp helpsq cost c_highinc, group(indid)
 nests(alt branch)

The first two command ran fine, however the last command result in an
 error message which is written as follow:

could not calculate numerical derivatives
flat or discontinuous region encountered

Can you assist me as to how to fix this model?

Thank you in advance,

Flora Au
Research Assistant
Centre for Health and Policy Studies
Dept. of Community and Health Sciences
University of Calgary
G012B, 3330 Hospital Drive NW
Calgary, AB T2N 4N1 Canada

Tel: (403) 220 8142
Fax: (403) 210 3818

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