When I mouse over myself in this Wednesday's raid (http://raids.cakeordeath-guild.com/raids/681),
it's showing the following stats for me:
Seated: 4 (1m), 16 (3m)
Signed Up: 4 (1m), 17 (3m)
Did Not Sign Up: 7 (1m), 13 (3m)
Raids: 11 (1m), 30 (3m)
I'm assuming 1m is 1 month, 3m is 3 months, but that would make
those way off. The table at the bottom of the page alone shows I
was signed up for, and seated for, the seven most recent raids.
In fact... signed up and seated for the previous seven, didn't
sign up for the two prior to that (1/24 and 1/28), signed up and
seated for the next previous seven... yeah, generally doesn't all
add up, unless I'm completely misinterpreting something.