Piece of cake.
You need to establish the dollar odds for each incremental rating.
using excel, make one column your rating, another the dollar odds it ran at, and another if it won. Simply use a "1" for a win.
(make it the true dollar odds by adjusting for the total booking percentage.)
you will also need a column for accumulated returns
now sort on your rating column. if you find profits within a specific range, test with new data.
At this time, don't be concerned by race type, surface, distance etc.. the public with take care of that for you.
I do this kind of stuff all the time, that's why I don't bet!!!
If your ratings are in a dbase format with a key field for track, race number and date, you can down load the results file from Bris and have fun with "what if".
Each data file race card was 25 cents some years ago.
ps, you may want to also normalize the results for each race and perhaps add a column for that. I would
