Hello, I need to figure out how to correctly start a survey research (what factors from a statistics perspective go into planning/are necessary) and if I will need to do any form of power calculation to know how many surveys I will need to administer?   Thanks! ... View more

Hello,    I am in great need of some guidance towards power calculation. I need to calculate the number of minimum subjects needed for a specific research study and the power of that study. I looked into proc power but am still a bit unsure of the whole thing and would appreciate some insight.    The research is pretty simple and basic. I have two groups undergoing the same surgery but patients in each group are being treated with a different drug (drug A and drug B respectively for each group), I would like to see if drug A is better than drug B. I am using a t-test for this comparison of means.    Thanks!  ... View more