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Date:         Wed, 14 Sep 2005 12:16:03 -0400
Reply-To:     Dan Zetu <dzetu@hotmail.com>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Dan Zetu <dzetu@hotmail.com>
Subject:      Re: averaged scales vs factor scores
Comments: To: plancede@yahoo.com
In-Reply-To:  <20050914143357.152.qmail@web34503.mail.mud.yahoo.com>
Content-Type: text/plain; format=flowed

Hi:

The problem with factor scores is that they are not scaled, i.e. they have always zero mean and 1 standard deviation. Plus, the methodologies employed to derive the scores are not as robust as the ones used in deriving the factor loadings.

The way people typically deal with this issue is what you actually mentioned: they construct summated scales (which in fact most of the time are simple averages) of the original values of the variables that load into one specific factor. Of course, the summated scales will not be orthogonal like factors (assuming you use an orthogonal rotation procedure like varimax) but they do work pretty well most of the time.

Dan

<BLOCKQUOTE style='PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #A0C6E5 2px solid; MARGIN-RIGHT: 0px'><font style='FONT-SIZE:11px;FONT-FAMILY:tahoma,sans-serif'><hr color=#A0C6E5 size=1> From: <i>Plance Debouver &lt;plancede@yahoo.com&gt;</i><br>Reply-To: <i>Plance Debouver &lt;plancede@yahoo.com&gt;</i><br>To: <i>SPSSX-L@LISTSERV.UGA.EDU</i><br>Subject: <i>averaged scales vs factor scores</i><br>Date: <i>Wed, 14 Sep 2005 07:33:57 -0700</i><br>&gt;I posted this with no lucky. How do I turn factor<br>&gt;scores based on rotated loadings of FA procedures<br>&gt;(scores obtained using regression method)into useful<br>&gt;values for further analysis. I would like to compare 5<br>&gt;groups of respondents.e.g nurses, doctors, Lab<br>&gt;technicians, students. I am told that factor scores<br>&gt;are not comparable across studies (they are sample<br>&gt;specific) but summated or averaged scores are.<br>&gt;<br>&gt;Any recommendation for types of further analyses on<br>&gt;factor scores or summed or averaged scales would be<br>&gt;appreciated.<br>&gt;<br>&gt;plance.<br>&gt;<br>&gt;<br>&gt;<br>&gt;__________________________________<br>&gt;Yahoo! Mail - PC Magazine Editors' Choice 2005<br>&gt;http://mail.yahoo.com<br></font></BLOCKQUOTE>


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