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st: re: nlogitrum

From   "Flora Au" <>
Subject   st: re: nlogitrum
Date   Thu, 28 Apr 2005 10:38:15 -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,

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