Re: Ordinal regression Test of parallel lines

Posted by David Greenberg on May 05, 2020; 5:29am
URL: http://spssx-discussion.165.s1.nabble.com/Ordinal-regression-Test-of-parallel-lines-tp5739103p5739105.html

For some kinds of estimation, the exact sampling distribution is
unknown, or is only known asymptotically (which is the case for
maximum likelihood estimation). In this case, significance tests are
not precise. There is no remedy for this. David Greenberg, Sociology
Dept., NYU

On Tue, May 5, 2020 at 1:12 AM Rich Ulrich <[hidden email]> wrote:

>
> It almost surely means that the output has some other warning
> which says something more.  Maybe, "The model fails to converge"
> or something like that.  Is it that, or something else?
>
> Increasing the number of iterations is an obvious thing to try, though
> that won't work if the solution steps are either drifting or cycling.
>  - It's conceivable to me that by might get a convergence if you
> /dropped/ some specific case, if that broke some numerical tie.
>
> I suspect that your N is relatively small compared to the number
> of variables in the model, because that's when problems are more
> likely.  In addition to mentioning your N and number of variables,
> you could say whether there /looks like/ there is some (big) effect.
>
> --
> Rich Ulrich
>
>
> ________________________________
> From: SPSSX(r) Discussion <[hidden email]> on behalf of NJ1979 <[hidden email]>
> Sent: Monday, May 4, 2020 11:05 AM
> To: [hidden email] <[hidden email]>
> Subject: Ordinal regression Test of parallel lines
>
> Hi,
> When I ran a ordinal regression by PLUM functionality in SPSS , for the test
> of parallel lines, I received this  messages
> "The Chi-Square statistic is computed based on the log-likelihood value of
> the last iteration of the general model. Validity of the test is uncertain."
> What does it mean and how to fix this ?
>
> Thank you,
> NJ
>
>
>
>
> --
> Sent from: http://spssx-discussion.1045642.n5.nabble.com/
>
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