Hi,
I want to calculate the MDE for a survey likert outcome measured on a 4-point scale, and I have the following groups w/ the respective sizes: 1) control (2000), 2) t1 (800), 3) t2 (1700), t3 (1700). I want to examine the coefficients on each of these t groups relative to the control via linear regression and also conduct t-test for each pair of treatment groups to examine whether there is any significance. In particular, I have a hypothesis that there is no difference between t1 and t2, but between t3 and t2 and t1. Without information on group means/SDs, is the following command the best way to proceed?
I want to calculate the MDE for a survey likert outcome measured on a 4-point scale, and I have the following groups w/ the respective sizes: 1) control (2000), 2) t1 (800), 3) t2 (1700), t3 (1700). I want to examine the coefficients on each of these t groups relative to the control via linear regression and also conduct t-test for each pair of treatment groups to examine whether there is any significance. In particular, I have a hypothesis that there is no difference between t1 and t2, but between t3 and t2 and t1. Without information on group means/SDs, is the following command the best way to proceed?
Code:
power oneway, power(0.8) n1(2000) n2(800) n3(1700) n4(1700)
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