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Average Earnings Index - AEI

Lifetime Average Earnings Index - AEI - indicates how much purse money the progeny of one sire has earned in relation to the average earnings of all runners in the same time frame. The average earnings of all runners is represented by an index of 1.00, and is calculated for each calendar racing year. A stallion's AEI is calculated for each year he has runners and then averaged for all years his progeny have raced.

Example (the data below is for example only, and not actual numbers)
Stallion A has had progeny race in each year from 1990 through 1994, a total of 5 years.
Year Avg. Earnings
All Runners
Avg. Earnings
Stallion A Runners
Index Representing
Avg. of All Runners
AEI Progeny
Stallion A
1990 $1,000 $1,500 1.00 1.50
1991 $2,000 $4,000 1.00 2.00
1992 $1,000 $3,000 1.00 3.00
1993 $2,000 $4,000 1.00 2.00
1994 $1,000 $2,000 1.00 2.00
Lifetime AEI of Stallion A = (1.50 + 2.00 + 3.00 + 2.00 + 2.00) divided by 5 = 2.10


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