BRIS speed ratings

[Tom]

What is the value of a point on the BRIS speed rating scale?

I looked at lots of old threads all morning, and came to the conclusion...who knows?

So looking at current data, consider the BRIS speed by Circuit for this week at Monmouth......

9/13 - two 1m16 races, #1 and #4 and two 6.0F races, #3 and #8
9/14 - four 6.0F races, #1, #3, #5, and #9

I plotted the SR point s and raw times and came up with a point at 1m16 is equal to .19 seconds, essentially a 1/5 of a second.
At 6.0F, a point was worth .131, .134, or .135, depending on how I treated the data from 9/14. On that day, races #1 and #5 did not line up on the trend line, while races #3 and #9 did, so it was a split variant.

Whichever, here is the data.....what do you think a point of SR is worth?

[Tom]

Here is what I want to do -

Two pace lines:

6F....110.2....92
6F....111.1....98

The second race was the faster race, but by how much?
how many tenths of a second is that 6 points worth?
What is the adjusted time of the first race? Is is 112.0?

[Clocker]

HOW MANY SPEED POINTS REPRESENT ONE LENGTH ?
The BRIS Speed Ratings points-per-length scale is based on the long accepted premise that as distances increase the value of a length decreases. On the BRIS Speed Ratings scale one length is approximately equal to 1 1/2 pts in sprints and approximately 1 point in routes.

Source: BRIS

[Tom]

That is lengths - I want time - how many points is 1/10 second worth.

[Speed Figure]

Would it not be 0.16 points per 1/10 of a second for 6 furlongs? so 6 points would be about 3.5 lengths.

[Clocker]

The times for each horse other than the leader at each call is an estimate based on the leader's time adjusted for beaten lengths. We don't know the actual times for horses other than the leader. If 1 length is assumed to be 1/5 second, and if 1 length is 1.5 Bris speed points, then 1/10 sec. equals 0.75 points.

If the numbers in Tom's second post represent the winning times and the winner's speed ratings, then the time difference is 4/5 seconds, or 4 lengths. And the 6 point difference in speed figs., at 1.5 points per length, would also be 4 lengths.

[Speed Figure]

I use the chart of 10/6 = 1.66 points per length for 6 furlongs.

[Tom]

I am lot looking at beaten lengths - time.
I want to adjust one pace line to another.
The 10/distance works for BLs, as does using that optin in the BRIS PP Generator - I substitute pace of race E1, E2, LP and SR for the race times.
But I want to compare final times of races.

[Billnewman]

I just ran some numbers on FL 1 mile and 40 yards and came up with one point of Bris speed # =.16 seconds i'll do a 6f after I help my boy with his geometry homework

[Light]

Originally Posted by Tom

Here is what I want to do -

Two pace lines:

6F....110.2....92
6F....111.1....98

The second race was the faster race, but by how much?

I'm assuming these are final times not internal pace times.

Since the 2nd race is faster by 6 points, and 1 length = 1.66 points (at 6f) Then:
6 points/1.66 points =3.61 lengths difference between the 2 races.This is confirmed when multiplying 3.61 lengths * 1.66 =6 points.

Originally Posted by Tom

how many tenths of a second is that 6 points worth?

1 speed points = 1/10 second = 1/2 length. 6 speed points = 6/10 seconds = 3 lengths

Originally Posted by Tom

What is the adjusted time of the first race? Is is 112.0?

Adjusted first race time = 110.2 +6/10ths = 110.8 Tenths.

Don't forget that the SR incorporates the variant and will cause some discrepancies.

The races you posted could not have been from the same day on the same track at the same distance or else the first race would have a higher SR.

[Exotic1]

Tom,

Don't know if this helps.


From the archives...

http://216.92.33.211/forum/printthre...?t=42306&pp=40



Tom 01-07-2008 03:22 PM
Been working on this and came up with some new values for a point of BRIS speed.
At 6 furlongs, I get 1 point = .12 seconds and at 1 mile, 1 point = .17
I had been using 0.1 for all distances, but got to many really odd times.
Theses two values are not really that constant either - lots of variation, or BRIS splits variants almost every other day.

I need to feed some more days in to my db to do the other distances.

[Tom]

Time and beaten lengths are not the same value.
I'm trying to figure out time.

And I can't find something repeatable.

[Robert Goren]

Originally Posted by Tom

Time and beaten lengths are not the same value.
I'm trying to figure out time.

And I can't find something repeatable.

If time was repeatable, every pool would be negative. You can spend the rest of your days trying to find a way to make time repeatable and you would die a broken man.

[Exotic1]

Originally Posted by Tom

Time and beaten lengths are not the same value.
I'm trying to figure out time.

And I can't find something repeatable.

This sounds like time:

At 6 furlongs, I get 1 point = .12 seconds and at 1 mile, 1 point = .17

[Tom]

Originally Posted by Robert Goren

If time was repeatable, every pool would be negative. You can spend the rest of your days trying to find a way to make time repeatable and you would die a broken man.

I'm talking about how much a point of SR is worth. I sit .13, .16? .2?