Re: Multi level odds ratio - help

Posted by Bruce Weaver on Jun 18, 2020; 2:04pm
URL: http://spssx-discussion.165.s1.nabble.com/Multi-level-odds-ratio-help-tp5739221p5739223.html

Hello Carlos.  You've had one reply from Gene Maguin, who took your use of
"multi level factor" to mean that you are estimating a multilevel logit
model.  I understood it differently:  I understood that you simply meant the
explanatory variable of interest, serum level, has more than two levels.
You suggested normal, borderline, and high.  For a categorical variable with
3 levels, one of them is designated as the reference category, and two odds
ratios are computed for each of the other levels versus that reference
category.  

But I wonder if the real problem is that serum level is a continuous
variable, and there are cut-off values corresponding to those labels.
Please clarify.  (If that is the case, things are a bit more difficult, but
not impossible. I'll wait until you clarify the situation before saying
more.)    

Cheers,
Bruce



meatduck wrote

> Hi,
>
> I'm a newbie when it comes to SPSS and Statistics, and in need of some
> help.
>
> I would like to know how to calculate a multi level factor odds ratio in
> SPSS, for an outcome (0 vs 1 : no disease vs disease) according to X
> protein
> serum levels (normal, borderline, high). And also if there's anyway to
> compare these odds ratio to another Y and Z protein.
>
> Thanks in advance,
> Carlos
>
>
>
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