Bioequivalence and Bioavailability Forum • Geometric mean?

Geometric mean? [Regulatives / Guidelines]

posted by BEQool – 2024-11-14 09:19 (584 d 09:11 ago) – Posting: # 24274
Views: 21,338

Hello Mittyri and Helmut,
thank you for your responses.

❝ Regarding geometric mean: kind of tricky taking into account the information above. The median is better, but why don't you want to follow the method mentioned in BE GL at the first place (arithmetic mean)? Yes, it is bad, but at least not worse than others :-D

Like Helmut pointed out, in the ICH M13A guideline it just says For the time-averaged method, either the mean or median value may be used., neither arithmetic nor geometric mean is mentioned.

❝ In other words, the geometric mean must only be calculated for positive real numbers

Then it is probably better not to use geometric mean and just use the median as you suggested (if BLQ values are anticipated).

❝ Well, the geometric mean is the maximum likelihood estimator of the median.

Is geometric mean always equal to median when we have "perfect" log-normal distribution of data set (very large sample)?

BEQool

Complete thread:

Baseline correction vs non-baseline correction jag009 2015-09-15 20:29 [Regulatives / Guidelines]
- Baseline correction vs non-baseline correction Lucas 2015-09-16 14:16
  - Baseline correction vs non-baseline correction Relaxation 2015-09-18 10:25
- Baseline correction or supra-therapeutic dose Helmut 2015-09-16 15:16
  - Baseline correction or supra-therapeutic dose Ohlbe 2015-09-16 17:55
    - Baseline profile prior to each period? Helmut 2015-09-16 18:15
    - Baseline correction examples Helmut 2015-09-17 15:44
      - Baseline correction examples Lucas 2015-09-18 14:19
        
        Baseline correction examples Helmut 2015-09-18 17:28
        
        Baseline correction examples Mauricio Sampaio 2016-02-07 03:05
        
        Baseline correction examples Lucas 2016-02-10 11:48
        
        Postmenopausal women Helmut 2016-02-10 12:26
        Baseline correction examples Mauricio Sampaio 2016-02-11 01:38
        Baseline correction examples Dr_Dan 2016-02-11 09:22
        
        Postmenopausal women Mauricio Sampaio 2016-02-12 03:24
        
        Postmenopausal women Dr_Dan 2016-02-15 17:45
        
        Baseline correction examples BEQool 2024-11-11 07:34
        
        Baseline correction GeoMean and Median mittyri 2024-11-11 11:20
        
        Geometric mean? Helmut 2024-11-11 14:53
        
        Geometric mean?BEQool 2024-11-14 08:19
        
        Geometric mean ≈ MLE of median Helmut 2024-11-14 09:54
        
        Geometric mean ≈ MLE of median Mahmoud 2024-11-15 11:26
        
        Bias? Helmut 2024-11-16 08:43
        
        Bias? Mahmoud 2024-11-16 11:12
    - Baseline; another example Helmut 2015-09-18 17:16
      - Baseline; another example nobody 2016-02-12 09:10
        
        Baseline; another example Helmut 2016-02-12 13:37
        
        Baseline; another example nobody 2016-02-12 14:08
        
        Slowly going OT: BE study simulations Helmut 2016-02-12 15:47
        
        Slowly going OT: BE study simulations nobody 2016-02-12 16:15
        
        Religious debate Helmut 2016-02-12 17:04
        
        Religious debate nobody 2016-02-12 17:26
        
        Religious debate ElMaestro 2016-02-13 12:53
        
        Religious debate nobody 2016-02-14 15:23
        
        Slowly going OT: BE study simulations Ohlbe 2016-02-13 13:10
        
        Slowly going OT: BE study simulations Helmut 2016-02-13 15:02
        
        Slowly going OT: BE study simulations lizhao 2016-02-25 17:31
        
        Business as usual Helmut 2016-02-25 17:44
        
        Business as usual lizhao 2016-02-25 17:59