FDA: PROC MIXED (‼) for ABE [Regulatives / Guidelines]

posted by Helmut Homepage – Vienna, Austria, 2021-09-17 17:15 (497 d 05:43 ago) – Posting: # 22581
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Hi Mahmoud,

❝ I think that using proc mixed to fit RTR/TRR/RRT design is not suitable, because in most cases proc mixed produced Estimated G matrix is not positive definite.


❝ So proc GLM recommended by FDA and Emea is more appropriate in the Semi-replicated designs


Please read the entire thread again. The FDA does recommend PROC MIXED for ABE in all guidances.
That’s the problem.

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