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re: st: Repeated measures with no between-participants vars?
I am trying to assess the way in which participants' evaluations of 3
HOW DOES THIS WORK? DOES EACH SUBJECT SEE 9 PRESENTATIONS (3 TIMES
FOR EACH OF 3 STIMULI) IN RANDOMIZED ORDER? SO SUBJECT 1 MIGHT HAVE
SEEN (1,1,1) (3,3,3) (2,2,2) WHEREAS SUBJECT 2 SAW A DIFFERENT ORDER.
JOSEPH IS THINKING YOU WERE CAREFUL ENOUGH TO BLOCK SUBJECTS INTO ONE
OF THE 6 POSSIBLE ORDERS (1,2,3; 1,3,2; 2,1,3; 2,3,1; 3,1,2; 3,2,1).
SO YOU PROBABLY HAD A MUTLIPLE OF 6 SUBJECTS. BECAUSE YOU HAVE MORE
THAN ONE SUBJECT PER ORDER IF THIS IS THE CASE, ORDER IS A BETWEEN
SUBJECTS FACTOR. YOU CAN MODEL IT OR NOT BUT IT SHOULD HAVE BEEN PART
OF THE STUDY DESIGN.
different stimuli change over time, as indicated in a series of
measurements. I am interested in checking whether the pattern of
in those evaluations is different for the different stimuli.
In other words, the two within-participants variables are (1) type of
YOU CAN MODEL THIS WITH EITHER ANOVA, MANOVA, OR XTMIXED, IN ADDITION
TO WHAT JOSEPH SAYS. FOR XTMIXED, SEE
stimulus, and (2) time of measurement. There are no between-
This seems like a simple task, but I haven't been able to get Stata
this for me. I tried a number of variations on the repeated ANOVA
but no luck. I would greatly appreciate any advice.
AND FOR ANOVA SEE
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