Bioequivalence and Bioavailability Forum

Concerta Guidance: S×F variance test [Regulatives / Guidelines]

posted by ElMaestro – Denmark, 2014-12-06 12:12 (3427 d 14:05 ago) – Posting: # 13995
Views: 12,306

Hi John,

❝ They are referring to σ²_D value being no greater than 0.03 right? Can the number be negative, i.e, -0.06?

A covariance cannot be negative. That should be the end of the story, but isn't: it may appear negative due to numerical optimiser phenomena even when REML is used for optimisation. The optimiser should of course warn you about it if you use decent software (given the recent events on the software scene I am not entirely sure how to define decent. Price and quality is seemingly not so well correlated :-D

—
Pass or fail!
ElMaestro

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Complete thread:

Concerta Guidance: Sub x Form interaction variance test jag009 2014-12-05 20:57 [Regulatives / Guidelines]
- Concerta Guidance: Sub x Form interaction variance test AngusMcLean 2014-12-06 01:28
  - Concerta Guidance: Sub x Form interaction variance test Helmut 2014-12-06 01:53
    - Concerta Guidance: Sub x Form interaction variance test jag009 2014-12-07 20:58
      - Concerta Guidance: S×F variance test AngusMcLean 2014-12-08 01:35
        
        Concerta Guidance: S×F variance test Helmut 2014-12-08 14:12
        
        Update: S×F variance test jag009 2014-12-08 17:40
        
        Update: S×F variance test AngusMcLean 2014-12-08 18:09
        
        EMA’s dataset I Helmut 2014-12-08 18:18
        
        EMA’s dataset I AngusMcLean 2014-12-08 19:55
        
        Update: S×F variance test jag009 2014-12-08 20:41
        
        Update: S×F variance test AngusMcLean 2014-12-08 18:18
        
        Question jag009 2014-12-10 17:01
        
        Question AngusMcLean 2014-12-10 18:34
        
        Update: S×F variance test kumarnaidu 2014-12-09 06:48
        
        Update: S×F variance test jag009 2014-12-09 15:16
        
        Update: S×F variance test AngusMcLean 2014-12-09 17:47
        
        Update: S×F variance test jag009 2014-12-09 18:01
        
        Update: S×F variance test AngusMcLean 2014-12-09 18:30
        
        Update: S×F variance test jag009 2014-12-18 15:31
        
        Update: S×F variance test AngusMcLean 2014-12-18 16:12
        
        Update: S×F variance test jag009 2014-12-22 17:28
        
        Update: S×F variance test AngusMcLean 2014-12-22 19:32
        
        Update: S×F variance test jag009 2014-12-22 20:19
        
        Update: S×F variance AngusMcLean 2014-12-22 20:45
        
        Update: S×F variance jag009 2014-12-22 20:51
        
        Update: S×F variance AngusMcLean 2014-12-22 21:10
        Update: S×F variance AngusMcLean 2014-12-22 21:36
        
        Update: S×F variance jag009 2014-12-22 22:18
        
        Update: S×F variance AngusMcLean 2014-12-22 23:26
        
        Update: S×F variance jag009 2014-12-23 04:43
        
        Update: S×F variance AngusMcLean 2014-12-23 15:24
        
        Update: S×F variance test AngusMcLean 2014-12-09 21:03
        
        Coding Helmut 2014-12-09 18:49
        
        working.... jag009 2014-12-09 22:24
- Concerta Guidance: S×F variance testElMaestro 2014-12-06 11:12
  - Concerta Guidance: S×F variance test AngusMcLean 2014-12-07 14:32
    - Concerta Guidance: S×F variance test ElMaestro 2014-12-07 18:08
      - Concerta Guidance: S×F variance test AngusMcLean 2014-12-07 23:13
        
        Concerta Guidance: S×F variance test ElMaestro 2014-12-08 12:25
        
        Concerta Guidance: S×F variance test nobody 2014-12-08 13:44
        Concerta Guidance: S×F variance test AngusMcLean 2014-12-08 14:03
        
        Concerta Guidance:S×F variance test nobody 2014-12-08 14:32

Concerta Guidance: S×F vari­­ance test [Regulatives / Guidelines]

Complete thread:

Concerta Guidance: S×F variance test [Regulatives / Guidelines]