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RE: st: loglikelihood and loglikelihood ratio


From   "Lachenbruch, Peter" <Peter.Lachenbruch@oregonstate.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: loglikelihood and loglikelihood ratio
Date   Tue, 17 Mar 2009 10:11:30 -0700

I haven't been following this in detail, but one issue that might
simplify matters would be for Jingjing to copy the commands from the
results window and the error messages received.  Only copy the relevant
parts of the output - I don't want to see 15 pages of garbage.  Maarten
has been very noble in this.

Tony

Peter A. Lachenbruch
Department of Public Health
Oregon State University
Corvallis, OR 97330
Phone: 541-737-3832
FAX: 541-737-4001


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of
jjc.li@utoronto.ca
Sent: Tuesday, March 17, 2009 9:45 AM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: loglikelihood and loglikelihood ratio

1. I just checked the commands for the 3 regions case and found they  
are right. But in the estimation of the unrestricted model, R square  
of one of the three equations are negative, R square of the other  
three euqations are positive. Does it cause the negative LR chi2 value?

2. In my 7 regions case, LR chi are positive. However, there's some  
strange thing about the degree of freedom. In unrestricted case, the  
parameters for equation 1, 2, 3 are 40, 8, 8, respectively. In  
restricted case, are 37, 7, 7. I though the degree of freedom should  
be 40-37=3. But the result of lrtest given by stata is LR chi(2).  
What's the problem?

Thanks.

Jingjing



Quoting Maarten buis <maartenbuis@yahoo.co.uk>:

>
> You definately should not use the -force- option. I was expecting
> that you were not telling us everything you did.
>
> -- Maarten
>
> -----------------------------------------
> Maarten L. Buis
> Institut fuer Soziologie
> Universitaet Tuebingen
> Wilhelmstrasse 36
> 72074 Tuebingen
> Germany
>
> http://home.fsw.vu.nl/m.buis/
> -----------------------------------------
>
>
> --- On Tue, 17/3/09, jjc.li@utoronto.ca <jjc.li@utoronto.ca> wrote:
>
>> From: jjc.li@utoronto.ca <jjc.li@utoronto.ca>
>> Subject: Re: st: loglikelihood and loglikelihood ratio
>> To: statalist@hsphsun2.harvard.edu
>> Date: Tuesday, 17 March, 2009, 2:59 PM
>> I am quite sure it's the same 3 regions. Because I just
>> input the 3
>> regions dataest. I will try to use-force-, then run it
>> again.
>>
>> Thank you.
>>
>> Quoting Maarten buis <maartenbuis@yahoo.co.uk>:
>>
>> >
>> > --- On Tue, 17/3/09, jjc.li@utoronto.ca  wrote:
>> >> The previous results is from the estimation of a
>> "7
>> >> regions dataset".
>> >>
>> >> Then I use almost the same command to do the
>> estimation of
>> >> a "3  regions dataset". The only thing I
>> change is that I
>> >> choose first 3 regions of the total 7 regions and
>> also
>> >> modify the command that related to the dummy
>> varible. This
>> >> time, it gives a negative value.
>> >
>> > Are you sure both models A and E refer to the same 3
>> regions?
>> >
>> > Did you specify the -force- option in -lrtest-?
>> >
>> > --Maarten
>> >
>> > -----------------------------------------
>> > Maarten L. Buis
>> > Institut fuer Soziologie
>> > Universitaet Tuebingen
>> > Wilhelmstrasse 36
>> > 72074 Tuebingen
>> > Germany
>> >
>> > http://home.fsw.vu.nl/m.buis/
>> > -----------------------------------------
>> >
>> >
>> >
>> >
>> >
>> >
>> >
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