I'm not an expert in this area, but I asked someone in our dept. who has
actually had a course on N=1 designs. He states that there really isn't an
appropriate stats. analysis for this kind of research, just descriptive. Is
this just an AB design or will it be an ABA design?
At 09:34 AM 3/9/99 -0500, Stephen Black wrote:
>I'm supervising a student who is collecting sequential data over
>days. There is a baseline period, followed by the application of a
>particular experimental condition. She would like to compare the data
>collected during baseline with the data collected during treatment
>(for example, seven days of baseline followed by seven days of
>treatment). Initially she would like to examine the data one subject
>at a time.
>
>She could do this, I suppose, with an independent t-test for baseline
>data compared with treatment data. But the data are in the form of a
>time series, and I recall that something called trend analysis may be
>appropriate.
>
>I've just started learning SPSS (a fugitive from SYSTAT), and I can't
>find anything in various how-to sources which deals with this issue.
>The only relevant book in the library is one called "Non-parametric
>trend analysis" and it's dated 1965, well before the age of SPSS. I'll
>check it out anyway, but I wondered if anyone here had any thoughts on
>this problem.
>
>Specifically, does anyone know how I can do a test for a difference
>between two trends on SPSS? This sounds like a problem that people
>using reversal designs in behaviour modification (when they're not
>swearing off statistics entirely) might have looked into.
>
>Failing that, perhaps someone has an e-mail address for an SPSS
>listserv that may deal with questions of this kind. SYSTAT had one,
>and Leland Wilkinson Himself would sometimes answer questions on it.
>
>-Stephen
>------------------------------------------------------------------------
>Stephen Black, Ph.D. tel: (819) 822-9600 ext 2470
>Department of Psychology fax: (819) 822-9661
>Bishop's University e-mail: [EMAIL PROTECTED]
>Lennoxville, QC
>J1M 1Z7
>Canada Department web page at http://www.ubishops.ca/ccc/div/soc/psy
>------------------------------------------------------------------------
>
>
>
Deb
Deborah S. Briihl
Dept. of Psychology and Counseling
Valdosta State University
Valdosta, GA 31698-0100
[EMAIL PROTECTED]
