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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/ >> > ----------------------------------------- >> > >> > >> > >> > >> > >> > >> > >> > * >> > * For searches and help try: >> > * http://www.stata.com/help.cgi?search >> > * http://www.stata.com/support/statalist/faq >> > * http://www.ats.ucla.edu/stat/stata/ >> > >> >> >> >> >> * >> * For searches and help try: >> * http://www.stata.com/help.cgi?search >> * http://www.stata.com/support/statalist/faq >> * http://www.ats.ucla.edu/stat/stata/ > > > > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**Re: st: loglikelihood and loglikelihood ratio***From:*Maarten buis <maartenbuis@yahoo.co.uk>

**Re: st: loglikelihood and loglikelihood ratio***From:*jjc.li@utoronto.ca

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