This is the method I use. It's similar to what Don Scott used to do. It's really for using on weight ratings with 1/2 kg differences, but you should still be able to use it on Unitab and Zipform ratings. I hope so anyway.

Firstly, you convert your ratings to a score out of 100 using this table:

Top rated horse = 100 points
0.5 kgs behind = 85 points
1.0 kgs behind = 70 points
1.5 kgs behind = 60 points
2.0 kgs behind = 50 points
2.5 kgs behind = 44 points
3.0 kgs behind = 38 points
3.5 kgs behind = 33 points
4.0 kgs behind = 28 points
4.5 kgs behind = 24 points
5.0 kgs behind = 20 points
5.5 kgs behind = 17 points
6.0 kgs behind = 14 points
6.5 kgs behind = 12 points
7.0 kgs behind = 10 points
7.5 kgs behind = 8 points
8.0 kgs behind = 6 points
8.5 kgs behind = 4 points
9.0 kgs behind = 3 points
9.5 kgs behind = 2 points
10.0 kgs behind = 1 point
10.5+ kgs behind = 0 points

Then you simply add up the scores of all the horses in the race to get a total. To get each horse's price you simply divide the total by their score.

Here's an example race:
No.1 - Rtg 59 = 100 points
No.2 - Rtg 57 = 50 points
No.3 - Rtg 56 = 38 points
No.4 - Rtg 54 = 20 points
No.5 - Rtg 53 = 14 points
No.6 - Rtg 56 = 38 points

The total of all the scores is 260, so you simply divide 260 by all the horses' scores, do a little rounding up or down and you get the following approximate dividends:

No.1 - $2.60
No.2 - $5.20
No.3 - $6.80
No.4 - $13.00
No.5 - $18.60
No.6 - $6.80

That is of course a 100% market. If you want to get a market which more accurately compares with TAB prices, you should actually multiply that figure of 260 by .85 and then divide it by the horses scores.

Anyway, I hope all that has been of some help.



[ This Message was edited by: sportznut on 2004-05-20 11:00 ]