Hello Stata-users,
My name is Maren from Hamburg. I am doing an evaluation about different
curricula in medical education. I have four different treatment groups
(students) to compare and longitudinal data for 7 different measuring times.
Since we have small sample size I would like to calculate the power for our
tests.
Does anybody know how to calculate power (or samplesize) for a four-sample
comparison with repeated measures?
I found that:
sampsi mean1 mean2, sd1() sd2() method(change) pre(x) Post(y) r1(z) n1()
n2()
works for two-sample comparison with repeated measures but not for a
four-sample trial.
The ADOs: simpower and ssizebi are brilliant for a four-sample comparison,
but do not offer a method for repeated measures.
If anybody solved this problem before, I would be glad for help.
Best regards,
Maren
*****************************************************************
Maren Kandulla
Wissenschaftliche Mitarbeiterin / Evaluation
Modellstudiengang Medizin
Universit�tsklinikum Hamburg-Eppendorf
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
