Some registries have established ratings to classify individuals' performance. In the United States, the Arabian Registry established a system of Achievement Awards in 1965. Superior horses receive points in recognition of their consistency in the show ring, on the racetrack, or in competitive trail and endurance rides. A racing Quarter Horse achieves a speed index rating, where a 100 matches a track's record. A high speed index, which might be abbreviated as s.i., indicates a fast race time.
Thoroughbreds earn distinction as winners of stakes races.
In a performance chart, you'll see codes of racing records. The letters SW indicate stakes winner. Thoroughbreds also are rated by breeding statistics. This reflects the horse's progeny racing performance, compared with other foals racing at that time. Both the AEI and CI start at an average of 1.00, which makes 2.00 twice the average.