Bioequivalence and Bioavailability Forum

Santa is coming [Power / Sample Size]

posted by d_labes  – Berlin, Germany, 2011-12-22 10:30 (5286 d 11:08 ago) – Posting: # 7806
Views: 11,741

Dear Helmut! Dear All!

❝ […] the term sqrt(2/N) has to be replaced by

❝   sqrt((1/n1+1/n2)/2)

❝ which gives different non-centrality parameters and in turn different power values if n1 not equal n2.

"Was lange währt wird gut" (Good things come to those who wait).

Let me dedicate PowerTOST version 0.9-2 (on CRAN now with release date 24-Dec-2011) to You as my Christmas gift. Of course also to all of you which doesn't celebrate this festival or don't go there (but to Florida ).
But! Do not open before Xmas !

Have a look into the NEWS and notice especially the function power2.TOST().
Hope that at least all adepts of 2-stage designs will find this gift to some extent useful .

❝ But I think for cases where the power itself is of value, f.i. for the first step of the evaluation of a 2-stage design via Potvin's Method C where the power has to be checked, it can make a difference

---

The power to know isn't necessarily SAS.

Best Christmas wishes and a Happy New Year,
Detlew Labes

Complete thread:

• Power for unbalanced cross-over d_labes 2011-01-14 15:21 [Power / Sample Size] 
  • Great post! Helmut 2011-01-14 16:16
    • Santa is comingd_labes 2011-12-22 09:30
      • PowerTOST Ben 2012-01-02 17:39
        • BIBDs Helmut 2012-01-02 17:53
          • Uuups d_labes 2012-01-17 11:49
            • the \tests subdirectory in a R-package yjlee168 2013-06-11 23:03
              • To demo() or not d_labes 2013-06-14 13:28
                • demo() is not demo yjlee168 2013-06-15 22:04
            • OT: issue of '\tests' subdir again yjlee168 2013-09-28 23:23
        • PowerTOST robust d_labes 2012-01-17 11:53