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Re: st: Overflow at level 1 in GLLAMM


From   Xiaoheng Zhang <zhangx@tcd.ie>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Overflow at level 1 in GLLAMM
Date   Tue, 21 Nov 2006 16:12:22 +0000

Dear Anders,

In my sample there are 12 countries as an alternative set and total 2076
observations(173 firms*12 countries).Frankly I am reluctant to remove any one of
them from the alternative set.Could I set a large memory for Stata to tackle
this problem.Currently the memory allocated to Stata is 100mb and the dataset is
far smaller than 100mb.

Thanks for advices.

Kevin 



 Anders Alexandersson <andersalex@gmail.com>:

> 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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