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RegisterStop estimating post hoc power! [Power / Sample Size]
posted by Helmut 
– Vienna, Austria, 2018-05-31 16:45 (2153 d 17:23 ago) – Posting: # 18833
Views: 7,522
Hi Valiveti,
So you were assuming a GMR of 90%, right?
Congratulations!
In this order? Can you give us their CVs and GMRs?
There is absolutely nothing to justify! Post hoc power is irrelevant. I strongly recommend to revise your SOPs covering the statistical / clinical report (i.e., don’t give this stupid value at all).
If a European assessor demands it (extremely unlikely!), ask where post hoc power is required in any of the current guidelines and suggest in a polite way to browse through my lectures (e.g., this pretty old one) or to attend training in basic biostatistics.
There are no routine statistical questions,
only questionable statistical routines. David R. Cox
❝ We have conducted a pivotal study for Europe with 48 subjects considering ~80% power, ISCV: 23%.
So you were assuming a GMR of 90%, right?
❝ The study was bioequivalent and 90% CI is within 80-125 for both Cmax & AUCt.
Congratulations!
❝ Power of Cmax and AUCt are 92% & 66% respectively.
In this order? Can you give us their CVs and GMRs?
❝ Kindly guide us how to justify the power less than 80% to HA.
There is absolutely nothing to justify! Post hoc power is irrelevant. I strongly recommend to revise your SOPs covering the statistical / clinical report (i.e., don’t give this stupid value at all).
If a European assessor demands it (extremely unlikely!), ask where post hoc power is required in any of the current guidelines and suggest in a polite way to browse through my lectures (e.g., this pretty old one) or to attend training in basic biostatistics.
There are no routine statistical questions,
only questionable statistical routines. David R. Cox
—
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Helmut Schütz
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Dif-tor heh smusma 🖖🏼 Довге життя Україна!
Helmut Schütz
The quality of responses received is directly proportional to the quality of the question asked. 🚮
Science Quotes
Complete thread:
- Power in the pivotal study (EU) valivetiananth 2018-05-31 13:49
![[Mix]](https://static.bebac.at/img/mix.png "open in Mix view")
- Stop estimating post hoc power!Helmut 2018-05-31 14:45
- Stop estimating post hoc power! ElMaestro 2018-05-31 15:43
- Confession Helmut 2018-05-31 17:16
- Confession ElMaestro 2018-05-31 21:47
- Confession Helmut 2018-06-01 00:01
- Confession ElMaestro 2018-06-01 08:31
- Silly-O-Meter: Syntax Helmut 2018-06-01 13:42
- Silly-O-Meter: Syntax ElMaestro 2018-06-01 15:17
- Silly-O-Meter: Syntax Helmut 2018-06-01 13:42
- Confession ElMaestro 2018-06-01 08:31
- Confession Helmut 2018-06-01 00:01
- Confession ElMaestro 2018-05-31 21:47
- Confession Helmut 2018-05-31 17:16
- Stop estimating post hoc power! valivetiananth 2018-06-02 08:52
- Eligible subjects? Helmut 2018-06-02 13:02
- Don’t we deserve an answer? Helmut 2018-06-09 15:13
- Stop estimating post hoc power! ElMaestro 2018-05-31 15:43
- Stop estimating post hoc power!Helmut 2018-05-31 14:45
Ing. Helmut Schütz