Re: More on Repeated Measures

Posted by Rose, Fred on Nov 29, 2006; 7:02pm
URL: http://spssx-discussion.165.s1.nabble.com/More-on-Repeated-Measures-tp1072284p1072287.html

I'm assuming your data are set up in 3 columns: group, dv_time1, and
dv_time2? I dummied up some data and did an analysis using the GUI (my
syntax matched your exactly) and got what I believe to be precisely the plot
you were looking for.  There is a red line connecting time 1 and time 2
means for group1 and a green line connecting time 1 and time 2 means for
group 2.   I'm using v11.0.3 for Mac, if that has anything to do with it,
but your syntax appears to be fine.

Sorry I can't be of much help.

Fred

--
Fredric E. Rose, Ph.D.
Assistant Professor of Psychology
Palomar College
760-744-1150 x2344
[hidden email]


On 11/29/06 10:14 AM, "D.R. Wahlgren" <[hidden email]> wrote:

> Gang,
> Since we're talking repeated measures...I just ran a simple 2-group
> by 2-time repeated measures analysis in SPSS v13 Mac, defining the
> syntax via the menus.
>
> I wanted to obtain a chart that showed the means on my DV by group
> and time--a typical type of chart with two lines (one line for each
> group) in two different colors or suchforth, with a legend that
> illustrated which line represents which group.
>
> However, the chart that I got has the 4 data *points* representing
> the 4 means, all in the same symbol (small open circles), and just
> one line that doesn't actually connect any of the points but appears
> to be connecting the average of the points at time 1 and the average
> of the points at time 2.
>
> My syntax came out as follows:
>
>
> GLM
>    DV_time1 DV_time2 BY Group
>    /WSFACTOR = time 2 Polynomial
>    /METHOD = SSTYPE(3)
>    /PLOT = PROFILE( time*Group )
>    /EMMEANS = TABLES(Group*time)
>    /PRINT = DESCRIPTIVE ETASQ OPOWER HOMOGENEITY
>    /CRITERIA = ALPHA(.05)
>    /WSDESIGN = time
>    /DESIGN = Group .
>
> Is there something wrong with the way that the plot is specified?
>
> thanks,
> Dennis
> --
>
> ```````````''''''''''''
> Dennis R. Wahlgren, M.A.
>
> Center for Behavioral Epidemiology and Community Health
> San Diego State University
> http://www.cbeach.org
>
>
> "Poets say science takes away from the beauty of the stars--mere
> globs of gas atoms.  Nothing is 'mere.'  I too can see the stars on a
> desert night, and feel them.  But do I see less or more?"
> --Richard Feynman