Bioequivalence and Bioavailability Forum • Still can't make it work

Still can't make it work [R for BE/BA]

posted by PharmCat – Russia, 2020-08-07 13:42 (169 d 07:05 ago) – Posting: # 21833
Views: 6,830

Hi ElMaestro!

» I tried to lump 6 subjects together at a time, and now I am getting an estimate of beta but it appears wrong, in the sense it is not corresponding to what I get for the full model.

If you calculate β with initial V - it will be wrong. It will be estimate for current V, then you calk REML end opimize θ... And then again... recalk β, ets... You can get initial β as β = inv(qr(X).R)*qr(X).Q'*y

But if you have wrong β at final iteration - it is bad case.

You can find same equation in LINDSTROM&BATES - 1.2 (where X not a design matix, but vector of X_i, IMHO)

If you provide me data from 6 subjects I can make calculations in Julia.

Magical linear algebra in julia:


using LinearAlgebra



X1 = [1 1 0 0 1; 1 0 0 0 1]


X2 = [1 1 0 0 1; 1 1 1 0 0]


Xv = Vector{Any}(undef, 2)

Xv[1] = X1

Xv[2] = X2

Xv'*Xv == X1'*X1 + X2'*X2 == vcat(X1, X2)'*vcat(X1, X2)

#true

Complete thread:

Semireplicated + REML in R ElMaestro 2020-07-10 13:19 [R for BE/BA]
- Semireplicated + REML in R Helmut 2020-07-10 19:03
  - Semireplicated + REML in R ElMaestro 2020-07-10 19:24
    - Avoid partial replicate designs, pleeeze! Helmut 2020-07-11 11:57
      - Avoid partial replicate designs, pleeeze! ElMaestro 2020-07-11 14:43
        
        Braveheart! Helmut 2020-07-11 15:38
        
        Who can help? ElMaestro 2020-07-12 12:28
        
        Who can help? ElMaestro 2020-07-12 13:26
        Update II ElMaestro 2020-07-12 21:36
        
        Update III ElMaestro 2020-07-12 21:46
        
        Final update today ElMaestro 2020-07-12 22:27
        
        Medium rare. Helmut 2020-07-13 13:52
        
        took just 52 hrs to do it :-) ElMaestro 2020-07-13 14:18
        
        Will take much more hours still… Helmut 2020-07-13 15:34
        
        Negative determinant ElMaestro 2020-07-14 03:22
        
        Are we loosers? Helmut 2020-07-14 13:58
        
        "we"? Loosers? ElMaestro 2020-07-14 15:07
        
        Misunderstanding? Helmut 2020-07-14 15:32
        
        Braveheart! ElMaestro 2020-07-13 10:13
        
        Braveheart! Helmut 2020-07-13 14:16
        Braveheart! PharmCat 2020-07-15 14:19
        
        Braveheart! ElMaestro 2020-08-02 17:39
- We were all blind (except Detlew) Helmut 2020-07-15 14:27
  - It is the opposite way around for me ElMaestro 2020-07-15 16:25
    - Desultory thoughts Helmut 2020-07-15 17:33
      - FDA RSABE is ISC d_labes 2020-07-15 18:13
        
        FDA RSABE is ISC Helmut 2020-07-16 11:11
      - Desultory thoughts ElMaestro 2020-07-15 23:06
        
        Desultory thoughts Helmut 2020-07-16 10:59
  - Phoenix - which template? mittyri 2020-07-19 00:42
    - FDA RSABE Project template_ v1.4.phxproj Helmut 2020-07-19 01:45
- "By popular demand": likelihood ElMaestro 2020-07-24 10:07
  - And by the way.... ElMaestro 2020-07-24 12:52
    - And by the way.... PharmCat 2020-08-03 14:24
      - Not understood ElMaestro 2020-08-03 22:55
        
        Not understood PharmCat 2020-08-05 01:41
        
        Not understood ElMaestro 2020-08-05 08:13
        
        Not understood PharmCat 2020-08-05 16:37
        
        Open issues ElMaestro 2020-08-06 21:11
        
        Open issues PharmCat 2020-08-07 00:02
        
        Open issues ElMaestro 2020-08-07 07:49
        
        Open issues PharmCat 2020-08-07 11:29
        
        Still can't make it work ElMaestro 2020-08-07 13:08
        
        Still can't make it workPharmCat 2020-08-07 15:42
        
        Still can't make it work ElMaestro 2020-08-07 16:44
        
        Still can't make it work PharmCat 2020-08-07 18:14
        
        Still can't make it work ElMaestro 2020-08-07 18:23
        
        And now it works ElMaestro 2020-08-07 21:31
        Still can't make it work PharmCat 2020-08-08 01:08
        
        Speed improvement ElMaestro 2020-08-08 12:25
        
        Speed improvement PharmCat 2020-08-08 17:27
        Speed improvement ElMaestro 2020-08-08 18:10
        
        Speed improvement PharmCat 2020-08-09 18:22
        Some tests... PharmCat 2020-08-10 11:48