Discriminant analysis

[Moshe Marko]

Hi,

I am trying to find strength threshold separating persons with and without
mobility difficulty. using the discrimanant analysis. Conducting the
discriminant analysis is there a way for me to know which level of strength
best differentiate between the groups? is there a reason that I should use
the discriminant analysis in place of the decision tree method?

Thanks

Moshe

Moshe Marko, PT, DPT, MHS, OCS, CSCS
Assistant Professor
Department of Physical Therapy Education
College of Health Professions
SUNY Upstate Medical University
Room 2232  Silverman Hall
750 Adams Street
Syracuse, NY 13210-1834
315 464 6577
FAX [phone]
[hidden email]

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[SR Millis-3]

I'd recommend that you use logistic regression instead of discriminant function analysis (DFA).  Logistic regression has fewer restrictive assumptions than DFA.  Its exponentiated linear function produces the probability of group membership.  You can also use the ROC curve to determine optimal cutoffs.  Logistic regression has several model fit indices to assess the adequacy of your model.

SR Millis
~~~~~~~~~~~
Scott R Millis, PhD, ABPP, CStat, CSci
Professor & Director of Research
Dept of Physical Medicine & Rehabilitation
Dept of Emergency Medicine
Wayne State University School of Medicine
261 Mack Blvd
Detroit, MI 48201
Email:  [hidden email]
Email:  [hidden email]
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Fax: [phone]


--- On Wed, 9/29/10, Moshe Marko <[hidden email]> wrote:

> From: Moshe Marko <[hidden email]>
> Subject: Discriminant analysis
> To: [hidden email]
> Date: Wednesday, September 29, 2010, 2:20 PM
> Hi,
>
> I am trying to find strength threshold separating persons
> with and without
> mobility difficulty. using the discrimanant analysis.
> Conducting the
> discriminant analysis is there a way for me to know which
> level of strength
> best differentiate between the groups? is there a reason
> that I should use
> the discriminant analysis in place of the decision tree
> method?
>
> Thanks
>
> Moshe
>
> Moshe Marko, PT, DPT, MHS, OCS, CSCS
> Assistant Professor
> Department of Physical Therapy Education
> College of Health Professions
> SUNY Upstate Medical University
> Room 2232  Silverman Hall
> 750 Adams Street
> Syracuse, NY 13210-1834
> 315 464 6577
> FAX [phone]
> [hidden email]
>
> =====================
> To manage your subscription to SPSSX-L, send a message to
> [hidden email]
> (not to SPSSX-L), with no body text except the
> command. To leave the list, send the command
> SIGNOFF SPSSX-L
> For a list of commands to manage subscriptions, send the
> command
> INFO REFCARD
>

=====================
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