Bioequivalence and Bioavailability Forum • Scaling of Cmin

Scaling of Cmin [Regulatives / Guidelines]

posted by zizou – Plzeň, Czech Republic, 2017-02-03 14:49 (2632 d 11:06 ago) – Posting: # 17006
Views: 10,760
(edited by zizou on 2017-02-03 18:47)

Dear VStus,
it looks like you reduced it too much.

❝ I have reduced Liu's dataset to have:

❝ subject - 20 levels (1-20)

❝ sequence - 2 levels (RT and TR)

❝ period - 2 levels (1 or 2)

❝ replication - 2 levels (1 or 2)

❝ AUC for Reference formulation.

When you reduce period for 2 levels - I think the change makes period to be equal to replication.
Period should still have 4 levels (1 or 2 or 3 or 4). If I am not mistaken.

Edit1: My mistake I don't have a data/reference and I thought the data was from 4 periods. After repeated reading I noticed that there were two periods only with created "repetition" term. I am sorry, I was too fast with replaying and I lacked the quality.

Edit2: If I get it right (I hope so) there is something like this scheme:

  period: 1    2

seq 1: ---TT---RR

seq 2: ---RR---TT

When we are interested only in R (per1+seq1 and per2+seq2 are not used at all). So in evaluation of only R data, Period 1 is equal to Sequence 2 (in the term of categorizing data) and Period 2 is equal to Sequence 1, so it's also known from subject No, when the data was obtaind (period 1 or 2). So period doesn't have any new information (the information is provided in other terms).
You may try:
anova(lm(log(AUC) ~ seq + rep + subj:seq, data=data, na.action=na.exclude))
(I'm curious if the results differ against the results with period in.)

Best regards,
zizou

Complete thread:

Type of study in modified release formulation EMEA Compliance 2014-03-13 09:43 [Regulatives / Guidelines]
- Type of study in modified release formulation EMEA nobody 2014-03-13 09:52
- Type of study in modified release formulation EMEA fno 2014-03-13 11:16
  - Type of study in modified release formulation EMEA kumarnaidu 2014-11-27 11:02
    - Type of study in modified release formulation EMEA nobody 2014-11-27 11:37
      - Type of study in modified release formulation EMEA kumarnaidu 2014-11-27 12:53
        
        Scaling of Cmin Helmut 2014-11-27 13:47
        
        Scaling of Cmin kumarnaidu 2014-11-27 15:12
        Scaling of Cmin kumarnaidu 2014-12-05 06:03
        
        Steady state kumarnaidu 2014-12-10 11:15
        
        Steady state nobody 2014-12-10 17:04
        
        Scaling of Cmin Dr_Dan 2014-12-10 17:21
        
        Scaling of Cmin Helmut 2014-12-10 18:40
        
        Scaling of Cmin d_labes 2014-12-11 13:09
        
        Scaling of Cmin Helmut 2014-12-11 14:53
        
        Scaling of Cmin VStus 2017-02-03 13:04
        
        Scaling of Cminzizou 2017-02-03 13:49
        
        Scaling of Cmin VStus 2017-02-03 15:37
        Scaling of Cmin VStus 2017-02-06 08:55