Intersubject CV from Proc mixed [RSABE / ABEL]

posted by jag009  – NJ, 2013-08-29 17:09 (4276 d 10:11 ago) – Posting: # 11385
Views: 5,244

Thank Detlew,

The output I first posted is from the FDA codes and yes "RANDOM treat/TYPE=FA0(2) SUB=subject G" is already there.

❝ This matrix can be interpreted as

(   s2bT     rho*sbT*sbR )

( rho*sbT*sbR   s2bR     )

❝ where the diagonal elements (inter-subject variances) can be converted to the CV's via

CVbT=sqrt(exp(s2bT)-1)

CVbR=sqrt(exp(s2bR)-1)


❝ Cave on the order in the G-Matrix. It depends on your coding for treatment.


Use the example output I posted originally, can you walk me through the above maze?

On another note (off topic but it's short so I might as well...) if you have a 2x2x2 crossover study carried out in 2 groups, would the following Proc GLM model statement be sufficient? The only one in the model statment which I have question on is PERIOD(GROUP).

MODEL &pk= GROUP SEQUENCE SUBJECT(GROUP*SEQUENCE) PERIOD(GROUP) TREATMENT GROUP*TREATMENT/SS1 SS3;
RANDOM SUBJECT(GROUP*SEQUENCE)/TEST;


Thanks
John

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