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st: Statistical advice about multiple comparison...


From   Yupa <lrdyupa@gmail.com>
To   Statalist <statalist@hsphsun2.harvard.edu>
Subject   st: Statistical advice about multiple comparison...
Date   Sat, 26 Jul 2008 00:04:14 +0200

Dear statalisters,

I have 9 test items and each item is scored ordinally 1 to 4 points 
(distance between points isn't equal).
The test is administered to two populations; in the first population 
each item is taken two times for each subject (at different ages). The 
second population served as reference.
Some of the test items show a ceiling effect (aren't able to 
discriminate at high end of the scale, and lower scores are not 
represented).
I have to compare the results of each item between the two timepoints of 
the first population and between each timepoint of the first population 
versus the reference population.
I think that an equality test for matched data is adequate for the first 
comparison (signrank) and an equality test for unmatched data (ranksum) 
for the second. 
Am I right or am I missing something?
May I analyze the data in a different way (different tests)?

Thanks in advance!
Francesco
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