Hi SeeDee,
I've fiddled with the fiddle factor on races since feb 04 with the following results:
0 to 8 Horses ----- 0.4464
9 - 12 Horses ----- 0.4592
13 + Horses ------ 0.4704.
Not much difference there.

I also found the average fiddle factor for different quinella prices and they are as follows.

Quinella 0 to $6, Avg fiddle factor 0.4207
6 - 12-------0.5001
12 - 25--------0.5026
25 - 50--------0.5079
50 - 100-------0.4914
100-200-------0.4591
200+ ---------0.4041
There is a regular sort of curve formed by the results with quinellas in the midrange having a higher fiddle factor. To me that means the short priced horses and the long priced horses are overbet in quinellas compared to the mid-priced ones.
Interesting even if it's not useful. :-)

Heavyweight,
Belated thanks for those trifecta formulae.

KV