Bioequivalence and Bioavailability Forum

Dear Joshi,

"by" stands for an interaction, and is programmed in SAS by "*"
"within" stands for nesting and is programmed by "()",
Thus,
1) Sequence by Group: is the interaction of group and sequence
2) Sequence * Group: is the same as 1)
3) period(within group): is the period nested in group
4) subject(within sequence by group): is the subject nested in the interaction of sequence and group
5) period nested within group: is the period nested in group

It's all something different (despite 1) and 2)), however, I think, that 3) and 5) don't make much sense and 4) is an extreme special case and very difficult to interpret.

Regards,
JPL