Posted by
Maguin, Eugene on
Nov 29, 2010; 9:55pm
URL: http://spssx-discussion.165.s1.nabble.com/multiple-response-analysis-how-to-report-tp3281344p3285294.html
Eins,
On 3): Basically, you have to describe your analysis model in sufficient
detail that someone else could replicate your work, describe any relevant
assumptions checking, report the results. Beyond that this is too
complicated to go into in a reply. Look at some articles that used repeated
measures and copy the format.
On 2): Not be coy, but maybe or maybe not. Given a legitimate expectation of
large enough effects, your sample would be perfectly adequate. Different
analysis models are possible. I don't judge myself knowledgable enough to
rank them on power.
On 1): A between-within repeated measures (RM) is a natural choice. But, it
may tell you more than you want to know. Your basic RM will give you two
main effects and an interaction. I'd guess that you are really interested in
the between main effect. I'm not quite sure how your measure works but I'd
guess that you are claiming that childhood dyads are 'closer' than
adolescent dyads (or vice-versa) where 'closer' means the difference between
person 1 and person 2 is smaller in the childhood dyads than in the
adolescent dyads. If so, then the within subjects main effect and the
interaction are irrelevant. So, a simpler analysis would be a t-test on the
difference between person 1 and person 2. By the way, you might want to
think about whether you should analyze the difference or the absolute value
of the difference in a t-test.
If differences are there, you want to give yourself the best chance of
finding them. That's a question of the power of different analysis models
given an effect size, N, and alpha. While a t-test is simpler, I can't
confidently say that it is more powerful. Others on this list can; perhaps
they will.
Gene Maguin
________________________________
From: SPSSX(r) Discussion [mailto:
[hidden email]] On Behalf Of
Eins Bernardo
Sent: Monday, November 29, 2010 8:00 AM
To:
[hidden email]
Subject: Repeated Measures GLM
Dear all,
The degree of closeness between dyad (younger-older pair of siblings) was
measured using a five-point Likert scale response format. A dyad can be
classified as either childhood (n=20) or adolescence (n=20). That is, a dyad
can belong only to one classification (for example, both the younger and
older are adolescence). I am using a repeated measures GLM such that the
dyad(younger-older pair of siblings) is considered as within-subjects factor
whle the level (childhood and adolecence) is considered as the
between-subjects factor. Three concerns:
(1) Is repeated measures GLM appropriate for my variables?
(2) I am sure my sample size is inadequate, please suggest an alternative
model (if any).
(3) What is the APA format for presenting GLM results?
Thank you in advance for your help.
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