K
Kev147
Here is an example, please note that the standard times figures etc,mentioned for the Curragh have been updated.
The lbs per length which I devised for each course and distance can be obtained from my standard time list, along with the furlong/distances to use.
I have highlighted the use of the lbs per calculation (Distance adjustment) below.
So in this example, the lbs per length calculation for 5f trip at the Curragh is 3.37, if a horse had run instead over 6f you would adjust the distance and use 2.82 lbs per length (See Standard times list).
In this example I used Dave Edwards "Top Speed" going allowance as an example, when I compile my own speed ratings I use my own going allowances
Here is an example how I rated the 2yo "Dawn Approach" over 5f trip at the Curragh on Sunday 25th March 2012.
One thing to note is that I do not use Weight For Age in my calcuations, you can if you want.
1. The going time for the race was +6.93s above standard.
2. The going allowance was -0.9s/f per furlong (the yeiding/Soft going was slowing the horses down).
3. I use .2 secs per length.
Now for the calculation:
multiply 5 furlongs by the going allowance i.e. -0.9
5 x -0.9 = -4.50s
As the race was run +6.93s outside standard subtract the updated going allowance correction i.e -4.50s. (note that if the going allwance was +4.50s you will have to add the going correction)
+6.93-4.50 = +2.43s.
Now divide the corrected going allowance of +2.43 by .2 secs per length.
2.43 /.2 = 12.15 lengths.
multipy the lengths by the lbs. per length calculation which is 3.37 lbs per length for 5f trip at the Curragh.
12.15 x 3.37 = 40.94
now subtract the figure 40.94 from 100.
100-40.94 = 59.06 or rounded down 59.
As Dawn Approach carried 9st 5lb we now have to adjust the speed figure of 59.
For weight carried over 9st adjust the figure for the rating i.e.
59 + 5lb = 64 ( this is Dawn Approach speed figure).
So if Dawn Approach had carried 8-11 we would have had to subtract 3lb from his speed figure i.e.
59 - 3lbs = 56.
Once you have arrived at any horses speed figure you could add the Weight for age allowance, I don't because it corrupts the ratings.
Dawn Approach ended up as my highest rated 2yo in 2012 with a speed figure of 102.
Standard times:
https://web.cloud.virginmedia.com/?shareObject=194f4b16-0ff1-8753-2530-079536e8cd56
National Hunt Ratings:
https://web.cloud.virginmedia.com/?shareObject=5b0aaf78-6d2a-5813-87c0-ee69b19afba0
Flat Ratings:
https://web.cloud.virginmedia.com/?shareObject=a4b24f84-8ef7-1af2-0ae1-02d14cbea9ad
Mike.
