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Date:         Fri, 23 May 2008 14:26:24 -0400
Reply-To:     Art@DrKendall.org
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Art Kendall <Art@DrKendall.org>
Organization: Social Research Consultants
Subject:      Re: comparing groups before and after treatment
Comments: To: ViAnn Beadle <vab88011@gmail.com>
In-Reply-To:  <001d01c8bcfd$0ee0cb20$2ca26160$@com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Great! I had recommended that SPSS implement a parallel coordinate plot.

Art

ViAnn Beadle wrote: > Depending upon the number of cases, a parallel coordinate plot might be more > illuminating since it directly shows the direction and magnitude of change > for each case. Once you get more than 50 cases, the results look like > somebody dropped the box of spaghetti onto the floor. This chart is > available using GPL and specifying a parallel coordinate. > > -----Original Message----- > From: SPSSX(r) Discussion [mailto:SPSSX-L@LISTSERV.UGA.EDU] On Behalf Of > Richard Ristow > Sent: Friday, May 23, 2008 10:16 AM > To: SPSSX-L@LISTSERV.UGA.EDU > Subject: Re: comparing groups before and after treatment > > At 05:51 PM 5/21/2008, David Hitchin wrote: > > >> Further to my previous suggestion, on the assumption that you have >> "before" and "after" measures for each variable, compute "change" = >> "after" - "before". A positive change is an improvement, a negative >> one a deterioration. You might then use Explore to produce a >> box-and-whisker plot, ... >> > > Yes. I'd also present side-by-side box-and-whisker plots of 'before' > and 'after'. That will be illuminating, though for 'before' vs. > 'after' designs, it may be too pessimistic. For example, suppose the > standard deviation of 'before' is 50, all patients improved 10 > points, and a 10-point improvement is clinically meaningful. Then the > side-by-side plots will look like little has happened, when actually > something useful has. > <snip/> > > ===================== > To manage your subscription to SPSSX-L, send a message to > LISTSERV@LISTSERV.UGA.EDU (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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