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Re: st: loglikelihood and loglikelihood ratio


From   jjc.li@utoronto.ca
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: loglikelihood and loglikelihood ratio
Date   Tue, 17 Mar 2009 12:44:58 -0400

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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>




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