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

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

posted by Helmut – Vienna, Austria, 2009-10-05 01:58 (5683 d 07:19 ago) – Posting: # 4294
Views: 32,380

Hi ElMaestro!

❝ Might be the way to go. One could hope that the author of Fartssie reads these discussions and looks into it.

Hhm, David logged in the last time in mid-March. But he has activated his e-mail in the forum and I had some nice conversations in the past.

❝ […] 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.

Sorry I'm of no big help now (still a lot of slides to prepare for a two-day workshop next week), but I think the algo uses a Taylor-expansion which is truncated after the first (?) term. One thing coming into my mind is the possibility that when we run into numerical issues, they may be resolved by going 'deeper' into the Taylor series?

❝ If anyone has any insight [...]

Sancta simplicitas, non!

—
Dif-tor heh smusma 🖖🏼 Довге життя Україна!
Helmut Schütz

The quality of responses received is directly proportional to the quality of the question asked. 🚮
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Complete thread:

non-central t, power, R: ElMaestro 2009-10-03 19:05 [🇷 for BE/BA]
- 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