Tutorial (from the start) [Power / Sample Size]

posted by Helmut Homepage – Vienna, Austria, 2020-05-08 11:08 (170 d 05:24 ago) – Posting: # 21408
Views: 4,626

Hi Alyssa,

» Thanks for the detailed tutorial!


» I was trying to follow your command and out in the powerTOST, however, i cant get the sample size estimation. May i know what has gone wrong?

Your results show that you did not attach the library (see Detlew’s post). However, this part of the code alone will still not work because the CV is not specified. You would get:
Error in sampleN.scABEL(CV = CV, design = res$design[j], targetpower = res$target[j],  :
  object 'CV' not found

I assumed that you will execute the entire code of the tutorial step by step. If you want only this part and/or the power analysis at the end, start with:

CVwR <- 0.426
CV   <- rep(CVwR, 2)

PS: R-terminology.

Dif-tor heh smusma 🖖
Helmut Schütz

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