Dear SPSS Users,
I am attempting a repeated measures analysis. The topic is: Does self-
efficacy change over time? Do results vary depending on the individual?
or subscale? or individual X subscale?
. measurements taken at three time intervals
. self-efficacy self-report instrument has 25 items (5 subscales with 5
items each).
. 10 cases
Is it appropriate to stack data vertically thus:
. total 250 rows (Cases X instrument items)
. 6 columns (Case ID/QuestionID/ScaleID/Time1/Time2/Time3)
This data arrangement produces insightful plots of
. average score X time
. average scale score X time
. average score X individual X time
. average scale score X individual X time
Will results the RM-GLM within-subjects F stats be valid, given that there
are 25 different items contributing to the overall result for each time
period? Are between-subject results compromised?
If I do not want to see the effects of "individual", I can arrange the
data in a more conventional horizontal manner and analyse each of the 25
items X time separately. However, there is an interest in each
individual's progress.
Kind regards,
Glenys Lafrance, Ph.D.
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