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Re: st: Overflow at level 1 in GLLAMM


From   "Anders Alexandersson" <andersalex@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Overflow at level 1 in GLLAMM
Date   Tue, 21 Nov 2006 10:14:32 -0500

Kevin (Xiaoheng Zhang <zhangx@tcd.ie>) wonders why overflow can happen
when using gllamm for a location choice problem:

I am running a multilevel regression model by -GLLAMM-.The initial
results are good but then the program reports "overflow at level 1 (173
missing values)".It keeps reporting this msg for a long time.Anyone has a > hint about this? [...] For you information,my command are
-gllamm location eatr cdrug2 dist ap sisters2 wage3 edu3 cai share if
highgrow==1&deudmy==0, nocons expand(id choice o) i(parentid2)
lin(mlogit) family(binom) nrf(10) eqs(eatr cdrug2 dist ap sisters2 wage3
edu3 cai share cons) nip(8) trace adapt-
I think that Stata's error message for numerical overflow, r(1400), is
helpful here, because gllamm uses numerical integration. The error
description for r(1400) begins with this sentence: "You have attempted
something that, in the midst of the necessary calculations, has
resulted in something too large for Stata to deal with accurately."
Thus, I guess that if Kevin tries to estimate a simpler model, the
message may disappear. Kevin, for example how many choice categories
do you have? Try with fewer choice categories.

Anders Alexandersson
andersalex@gmail.com
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