How to calculate power correctly? [Power / Sample Size]

posted by BE-proff – 2016-12-03 21:53 (3488 d 18:06 ago) – Posting: # 16829
Views: 7,924

Hi All,

Let's say I have the followind results after typical BE-study:

n=30, CV=0.20, ratio=0.97, UL=1.02 and LL=0.92

if I want to calculate power using default settings of PowerTOST I see:

power.TOST(CV=0.20, n=30)
[1] 0.948603


If to add ratio I have:

power.TOST(CV=0.20, n=30, theta0=0.97)
[1] 0.9781158


If to use also limits of CI result the result is:

power.TOST(CV=0.20, n=30, theta0=0.97, theta1=0.92, theta2=1.02)
[1] 2.334844e-05
:confused:

Do I use formulas correcly and which option is better? :-)

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