Re: Multinominal hierarchical logistic regression follow up

Posted by Jon K Peck on Aug 17, 2011; 2:30am
URL: http://spssx-discussion.165.s1.nabble.com/Multinominal-hierarchical-logistis-regression-follow-up-tp4706318p4706574.html

And note, Bruce, that the SPSSINC CREATE DUMMIES extension command will do all the dirty work of creating dummies and even define a macro covering k-1 of them.  Of course, it requires the Python Essentials.

Jon Peck (no "h")
Senior Software Engineer, IBM
[hidden email]
new phone: [phone]




From:        Bruce Weaver <[hidden email]>
To:        [hidden email]
Date:        08/16/2011 08:22 PM
Subject:        Re: [SPSSX-L] Multinominal hierarchical logistis regression              follow up
Sent by:        "SPSSX(r) Discussion" <[hidden email]>

---

Martin, when you say you treated all variables as covariates, does that mean
you just stuck "factors" in the covariates box without doing anything to
them first?  For any factors that have more than two categories, you
definitely do not wan to do that.  For a factor with k levels (or
categories), you would need to construct k-1 variables to enter as
covariates (to account for the k-1 degrees of freedom).  One common approach
is to compute k-1 indicator variables (1=in the category, 0 = not in the
category).  The omitted kth category is the reference category to which the
others are compared (via Wald tests) in the table of coefficients.

Re doing hierarchical regression with NOMREG, see my other post.

HTH.



msherman wrote:
>
> I just discovered that if I moved my variables which I entered as
> covariates into the factor's box I then get the option to use various
> enter methods.  But my variables are not factors, many are continuous
> variables so I treated all of my variables as covariates.  With covariates
> only one does not have the option to use various enter methods.  Puzzled.
>
> 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
> [hidden email]&lt;[hidden email];
>


-----
--
Bruce Weaver
[hidden email]
http://sites.google.com/a/lakeheadu.ca/bweaver/

"When all else fails, RTFM."

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To send me an e-mail, please use the address shown above.

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