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Date:         Wed, 29 Apr 1998 16:16:29 -0400
Reply-To:     "William B. Ware" <wbware@EMAIL.UNC.EDU>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@UGA.CC.UGA.EDU>
From:         "William B. Ware" <wbware@EMAIL.UNC.EDU>
Subject:      Re: Clarification of Factor analysis problem
Comments: To: "Thompson, Bill T." <Bill.Thompson@NAVY.BROOKS.AF.MIL>
In-Reply-To:  <c=US%a=_%p=BROOKSAFB%l=BASIA-980429195054Z-1456@basia.brooks.af.mil>
Content-Type: TEXT/PLAIN; charset=US-ASCII

On Wed, 29 Apr 1998, Thompson, Bill T. wrote:

> My apologies for being unclear. The study looked at differences between > three groups: > > 1. Control > 2. Attention deficit disorder on medication > 3. Attention deficit disorder off medication

From this, I gather that these are three "independent groups"...

> The dependent variables were 19 brain sites from EEG data collection > system. > The purpose of performing the Factor analysis was to see if the activity > with various brain sites grouped together in any meaningful way among > the varyous groups. Therefore, by example, > > Trial 1 Group 1 > Factor 1 sites 1-10 > Factor 2 sites 11-15 > Factor 3 sites 16-19 > > Trial 1 Group 2 > Factor 1 sites 1-13 > Factor 2 sites 14-19 > > Trial 1 Group 3 > Factor 1 sites 14-19 > Factor 2 sites 11-13 > Factor 3 sites 1-10

Based on what I see, there might be two "factors" which could be considered "consistent" across the three groups... Factor A could be comprised of sites 1-10, and Factor B could be sites 16-19. Sites 11-15 appear to be inconsistent... which of course, might be interesting in and of itself... but if you are interested in comparing the three groups, I suggest that you use "my" factors A & B...

__________________________________________________________________________ William B. Ware, Professor and Chair Psychological Studies CB# 3500 in Education University of North Carolina PHONE (919)-962-7848 Chapel Hill, NC 27599-3500 FAX: (919)-962-1533 http://www.unc.edu/~wbware/ EMAIL: wbware@unc.edu __________________________________________________________________________


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