Power Calculation using Stata

zvcrt

New Member
#1
Hi,

I am involved in a clinical study where I need to ascertain that the study has adequate power. The study aims at understanding the effect of a program on patients. We are required to have a control and a treatment sample. I believe I can recruit about 22 individuals for the study in each group. We think a repeated measures approach (observation at time =0, time =3months, time =6 months) would be best. Could you please help me understand how I can do a power calculation using STATA for such a project? I have heard about "sampsi" but am not sure if that would help. Please advise.
 

bukharin

RoboStataRaptor
#2
What outcome will you be measuring? Is it continuous, categorical..? What statistical tests are you planning? Do you have any pilot data to assist your calculations?

sampsi can do a fair bit, but it seems to me to be a little limited for repeated measures.