Stata The Stata listserver
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

st: powercalculation for four-sample trial with repeated measures

From   "Maren Kandulla" <>
To   <>
Subject   st: powercalculation for four-sample trial with repeated measures
Date   Thu, 23 Jun 2005 09:04:29 +0200

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
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()

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 Kandulla
Wissenschaftliche Mitarbeiterin / Evaluation
Modellstudiengang Medizin
Universitätsklinikum Hamburg-Eppendorf

*   For searches and help try:

© Copyright 1996–2015 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index