Re: Hierarchical Multinominal logistic -Can it be done in spss

Posted by Bruce Weaver on Aug 17, 2011; 2:15am
URL: http://spssx-discussion.165.s1.nabble.com/Hierarchical-Multinominal-logistic-Can-it-be-done-in-spss-tp4706306p4706503.html

I've just been looking at NOMREG in the CSR Manual (aka the "fine" manual), and it would seem you are correct.  Re the /MODEL sub-command, the manual says, "If more than one MODEL subcommand is specified, only the last one is in effect."  It appears one can perform various flavours of stepwise selection (forward, backward, BSTEP and FSTEP), but not hierarchical regression.  

So, what you'll have to do is run NOMREG multiple times.  (One has to do this with procedures like MIXED too, by the way.)  One thing you have to watch for is that as you add more variables, the number of cases could be reduced if there are missing values.  You don't want that, because the likelihood ratio tests for comparing one model to the next are only valid when all models use the same cases.  You could set a filter at the outset for cases that have valid data on all of the variables in the most complex model.  Alternatively, I think you can probably list all explanatory variables for every model (following the BY and WITH keywords), but only include subsets of those variables as needed on the /MODEL subcommand.  

HTH.

msherman wrote

Dear list: I am attempting to conduct a hierarchical multinominal logistic regression but when I use the menu there are no selections that allow me to enter particular variables as different stages. Within MRA one has the capability of ordering variables according to one's theory, etc. One can use Enter on the first step, and the enter on the NeXT step, but within multinominal they are not to be found.  Can this be done via writing syntax? thanks.

Martin F. Sherman, Ph.D.
Professor of Psychology
Director of  Masters Education in Psychology: Thesis Track

Loyola University Maryland
Department of Psychology
222 B Beatty Hall
4501 North Charles Street
Baltimore, MD 21210

410-617-2417
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