Posted by
Zdaniuk, Bozena-3 on
Jul 19, 2011; 7:22pm
URL: http://spssx-discussion.165.s1.nabble.com/repeated-measures-anova-tp4613114p4613389.html
Dear "Thanks in advance", I find your description of your data/design a bit confusing. First of all, RM ANOVA is used to test longitudinal changes in a continuous dependent variable. Do you have a continuous DV in your design? That is, did you measure some quantifiable something (intelligence, body temperature, etc.) at each time point?
it seems to me that this is the first question that needs to be answered here before we can help you further. What do others think?
bozena
----- Original Message -----
From: "pjiman1" <
[hidden email]>
To:
[hidden email]
Sent: Tuesday, July 19, 2011 11:06:46 AM GMT -08:00 US/Canada Pacific
Subject: repeated measures anova
I'm trying to conduct a Repeated Measures ANOVA in SPSS. My syntax is pasted
below.
I am trying to obtain results where both time and scale are
repeated/within-subject factors and then test for time, scale, and
time*scale effects---where all scales at all times listed as variables.
My data are in wide form. The wave variables are coded two ways: one set has
variables wave1 to wave 5 each coded as 0,1, indicating which subject has
data for each wave, the other set has variables w1 to W5 coded as 1,2,3,4,5
depending on which subject has data for each wave.
The problem is that I am unable to obtain an F-test for the time variable.
And I also cannot generate the interaction.
GLM wave1 wave2 wave3 wave4 wave5 W1Char W2Char W3Char W4Char W5Char
/WSFACTOR=time 5 Polynomial
/MEASURE=wave char
/METHOD=SSTYPE(3)
/PLOT=PROFILE(time)
/EMMEANS=TABLES(time) COMPARE ADJ(BONFERRONI)
/PRINT=DESCRIPTIVE ETASQ
/CRITERIA=ALPHA(.05)
/WSDESIGN=time.
I suspect that a) I have a fundamental error in my setup, b) I am
overlooking a minor problem with my syntax, or c) I suspect that my wave
variables (i.e. time) are coded incorrectly. Or is there some other problem
with my setup?
I am not interested in recasting the analysis in SAS, HLM, or Structural
Equation Modeling. My boss is looking for a quick and simple solution to
this in SPSS.
Thanks in advance.
--
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