I love the new stats (CPI, SPR). I’ve been sitting here for ages, just checking them out for my ponies. This is AWESOME!
…and what do they mean? 
I need to verify how SPR is calculated, since I think it’s off for some horses. But yes, yay stats!
In case anyone doesn’t know what they are, CPI is class performance index, which provides a factor of average earnings, by age/gender.
So Joe is a 5yo colt - as a 2yo he earned $20k in 2 starts, giving him an average of $10k/start. If all the other 2yo colts that year had an average of $6k/start, Joe’s CPI would be 1.67 (10/6). Any 2yo earning 6k/year in that year would have a CPI of 1.00, and any earning less would have one < 1.00. It’s calculated per year (so as a 3yo Joe gets compared to 3yo colts), and the number at the top of the page is the average of all his years’ CPIs.
SPR is starts percentile ranking. It also uses average earnings per start, and compares against same age/gender horses. If Joe’s 2yo SPR is 70%, that means his average earnings/start (10k) is greater than 70% of the other 2yo colts that year.
I need to look at the calculations again, though, as Can’t Catch Me, for example, has SPRs >= 90% for the first 4 years of racing, and then it drops to 24% for her 5th year (where she only ran 4x, so it shouldn’t have affected her average earnings that much). I plan/hope to make the calculations cumulative (so it counts lifetime-to-date earnings/start rather than year-by-year, to - theoretically - give a smoother graph).
Anyway - stats geekery for the win. 
FYI, I think I’ve fixed SPR now.
Knowing that information makes it so fun to go through your horses and compare - it’s like getting a whole new stable to explore!
Thank you for adding this - it’s informative, and fun!
Thanks. 
I plan to add leaderboard charts based on these stats as well.