The Longevity of a PRI Score
A PRI score will change with time, but what is the longevity of a PRI score? Any process that involves statistical methods is only as good as the information in a data base. This particularly true when the data is continually changing. Any method using a data base must be robust enough to accommodate these changes. A data base which involves racehorses is continually changing. Just consider the AEI (Average Earning Index). Every run a horse has will change its AEI value. Similarly, every time a horse wins a Stakes Race, the pedigree compatibility factors will also change. The change will be almost imperceptible for a cross such as Northern Dancer x Mr Prospector. But what about the lesser lights?
Up Dated Results
To test the robustness my analysis system I re-examined the data entered in my first post of 2.5 years ago (Yearling Prices and Racing Ability: the rewards are hard to find). The updated results are given in the table below:
*PRI Score measured Feb 2019
**PRI Score measured Aug 2012
***PRI Band/Medium AEI is from Flavone Private data base. For example, Honesty Prevails with a PRI score of 93.8 lies in the data base band of PRI scores 95-90 which have a medium AEI value of $110k.
Firstly, as a prelude I need to state that the examination of seven horses is hardly statistically significant, but my conclusions are backed up by a considerable amount of data I have accumulated in over 20 years researching the subject. Secondly, breeding and/or finding good horses is an inexact science with a bit of art thrown in. For example, within PRI bands there is considerable variation in AEI values. However, I would predict that more likely than not the AEI figure is close to what you would expect from a horse with PRI values within that band.
- The PRI values measured for these horses in 2019 have not changed dramatically from those measured in 2021. The longevity of a PRI score held up well.
- In their racing career all these horses failed to return anywhere near their purchase price.
- The link between PRI score and AEI is reasonable for these seven horses. What was predicted is reasonably close to what was achieved.
- A phone call to me in 2019 would have saved some people a lot of money!