3D [Power / Sample Size]

posted by Helmut Homepage – Vienna, Austria, 2017-02-06 13:47  – Posting: # 17021
Views: 19,816

Hi zizou,

» I know, someone can do it better (eg. in 3D like this kind of figure).

Your wish is my command. 3D-plots for GMR 0.95. Not sure whether they are more informative than yours.

Conventional BE (rest of the world)


Denmark: 100% included in 90% CI


I know only a few sample sizes by heart. One is for GMR 0.95, CV 30%, and target power 80%: 40 (expected power 81.6%). For Denmark with n=40 we get a mere 76.5%. Note the red contour lines at 70% power. As you discovered as well we never reach 80%. Fascinating the behavior at low CVs. If we increase the sample size, power decreases because a significant difference gets more likely. What a mess.

Dif-tor heh smusma 🖖
Helmut Schütz

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