Thanks Ted and Hoof
This is from the factor analysis manual
August 9th was a Saturday
Parx runs live racing Saturday Sunday Monday and Tuesdays
unless there is a Monday holiday, In that case they may also run on Weds.
They may card a race on Friday if its a big race weekend like the triple crown races or the breeders cup ,
When they came back to race on Saturday August 9th, they had not raced
since Tuesday.
I want to look closer at that first race on the 9th I find it odd that a MC 10 for 3+ F
( bottom of the class ladder ) would produce so many fast times