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Date:         Fri, 25 Mar 2005 14:37:25 -0500
Reply-To:     Jeff Stuewig <jstuewig@gmu.edu>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Jeff Stuewig <jstuewig@gmu.edu>
Subject:      computing mediated effect and sobel
In-Reply-To:  <42445FA9.7060508@jura.uni-hamburg.de>
Content-type: text/plain; charset=us-ascii; format=flowed

When computing the mediated effect (a*b or c - c` ) can one use either the unstandardized b weight or the standardized beta? Additionally, can you use either for computing the sobel test? I was always taught to use the unstandardized b weight and its corresponding standard error but in Howell's book "Statistical Methods for Psychology" he uses the standardized beta and its standard error. Are these equivalent? Thanks.

Jeff


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