Bioequivalence and Bioavailability Forum

Adaptive TSD vs. “classical” GSD [Two-Stage / GS Designs]

posted by ElMaestro  – Denmark, 2015-11-27 20:54 (3421 d 19:54 ago) – Posting: # 15681
Views: 13,963

Hi Hötzi,

❝ Given all that: Why should one use a GSD instead of a TSD?

It is a great question, and I will not offer a definitive answer, but I will volunteer an opinion

You can look at it this way: A GSD is a kind of TSD where you make assumptions about both the GMR and the CV (you use the anticipated ones, not the observed ones) when you transit from stage 1 to stage 2. That anticipated pair of CV+GMR is exactly the (or a) combo that naïvely doubles the sample size. Simple but extremely rigid.

Thereby the GSDs should be considered a relic from bygone ages when computers were not fast enough to allow simulations to achieve what Potvin et al. have done.

Complete thread:

• Adaptive TSD vs. “classical” GSD Helmut 2015-11-27 19:05 
  • Adaptive TSD vs. “classical” GSDElMaestro 2015-11-27 19:54
  • “classical” GSD - E[n] d_labes 2015-11-30 11:15
    • Apples are pears by comparing the weight Helmut 2015-12-01 16:35
      • Apples are pears by comparing the weight d_labes 2015-12-03 09:16
        • Apples are pears by comparing the weight Helmut 2015-12-03 13:10
          • Oranges d_labes 2015-12-03 13:56
  • Adaptive TSD vs. “classical” GSD Ben 2015-12-02 19:27
    • Adaptive TSD vs. “classical” GSD Helmut 2015-12-03 03:11
      • “classical” GSD alpha's d_labes 2015-12-03 09:47
        • N sufficiently large‽ Helmut 2015-12-03 14:56
          • An other one with 0.0304 d_labes 2015-12-03 16:15
            • An other one with 0.0304 Helmut 2015-12-03 16:26
      • Adaptive TSD vs. “classical” GSD Ben 2016-01-10 12:43