Bioequivalence and Bioavailability Forum • non-central t, power, R:

non-central t, power, R: [🇷 for BE/BA]

posted by ElMaestro – Denmark, 2009-10-04 23:51 (6091 d 17:21 ago) – Posting: # 4293
Views: 45,641

Dear HS,

❝ Have you considered contacting Russell Lenth (author of ASA243 and the VBA-routines in FARTSSIE)?

Might be the way to go. One could hope that the author of Fartssie reads these discussions and looks into it. It is of course true, depending on how we look at this there is a lot of numerical integration and/or summation going on, and a lot of 'small' errors would indeed sooner or later amount to a 'large' error. To be honest I am just a little sceptical here, because we are not really involving extreme values of t or the noncentality parameters, so I am not at this point fully convinced that this is no more than just a numerical precision issue.
Must read some more papers, I guess. Or implement some C library which works with 117 decimals or something obscene and try anew.

If anyone has any insight into how Al Gore Rhythms can be validated when true results at the test conditions are not known then I'd be happy to learn it. Or even better, how to determine under which conditions ASA243 is accurate to 3 decimals or something like that.

EM.

Complete thread:

non-central t, power, R: ElMaestro 2009-10-03 19:05
- non-central t, power, R: Helmut 2009-10-03 21:45
  - non-central t, power, R:ElMaestro 2009-10-04 21:51
    - non-central t, power, R: Helmut 2009-10-04 23:58
- non-central t is not the question d_labes 2009-10-05 12:58
  - SAS -> R -> SAS Helmut 2009-10-05 14:53
    - Lost in translation d_labes 2009-10-06 14:31
      - Lost in translation Helmut 2009-10-06 14:42
        
        Macacus cynocephalus d_labes 2009-10-06 15:14
        
        Lost in translation Helmut 2009-10-06 21:46
  - non-central t is not the question ElMaestro 2009-10-05 17:32
    - Power of TOST in R d_labes 2009-10-06 16:45
      - Power of TOST (R package MBESS) Helmut 2009-10-07 02:18
        
        Power of TOST (R package MBESS) d_labes 2009-10-07 08:46
        
        Power of TOST (R package MBESS) Helmut 2009-10-07 12:38
      - The Power at limits d_labes 2009-10-07 11:32
        
        Power at limits 2 d_labes 2009-10-07 15:15
        
        package MBESS Helmut 2009-10-07 22:36
        
        Package MBESS and Power curiosity d_labes 2009-10-15 14:57
        
        Package MBESS and Power curiosity ElMaestro 2009-10-17 12:26
        
        Apfelstrudel and EFG 2.01 Helmut 2009-10-17 13:44
        EFG and another power curiosity d_labes 2009-10-20 11:35
        
        EFG and another power curiosity ElMaestro 2009-11-23 19:03
        
        EFG and another power curiosity Helmut 2009-11-23 19:17
- non-central t, power, R: yjlee168 2009-10-07 00:08
  - PASS Helmut 2009-10-07 01:16
    - PASS yjlee168 2009-10-12 23:17
- R code for power ElMaestro 2009-10-09 11:32
  - Belgian beer ? Ohlbe 2009-10-09 11:50
  - Another one - R code for power of TROST d_labes 2009-10-09 13:50