Re: Ordinal regression Test of parallel lines

Posted by Bruce Weaver on May 05, 2020; 3:45pm
URL: http://spssx-discussion.165.s1.nabble.com/Ordinal-regression-Test-of-parallel-lines-tp5739103p5739106.html

See the documentation for the CRITERIA sub-command for info on how to try
some of the things Rich suggested.

https://www.ibm.com/support/knowledgecenter/en/SSLVMB_26.0.0/statistics_reference_project_ddita/spss/advanced/syn_plum_criteria.html

Does the same thing happen if you estimate the model via GENLIN rather than
PLUM?  (When using GENLIN, specify "DISTRIBUTION=MULTINOMIAL LINK=CUMLOGIT"
on the /MODEL sub-command.)

HTH.


Rich Ulrich 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 <

> SPSSX-L@.UGA

> > on behalf of NJ1979 <

> drnagesh@

> >
> Sent: Monday, May 4, 2020 11:05 AM
> To:

> SPSSX-L@.UGA

>  <

> SPSSX-L@.UGA

> >
> 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
>
>
>
>
> --
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