Bioequivalence and Bioavailability Forum

Many thanks, BEQool and Myttyri.

❝ there are only 6 possible designs for Williams design with 4 treatments.

❝ Your design X is not one of the 6 possible designs while Y design is.

❝ Please see Helmut's post:

It seems that I wrongly remembered that there would be more than 20 combinations for 4-treatment William Design. The link BEQool mentioned is from 2023, and I only remember the older post in 2022 mentioned in my previous post...

❝ Take a look at the excellent article prepared by Helmut regarding Higher-Order Crossover Designs, especially at Acknowledgment section 

Oh, haven't read that one yet, but just peeked at the section you mentioned ... my my!