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 AEI 
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Handicapper

Joined: Fri Jan 15, 2010 8:05 am
Posts: 204
Post AEI
Have just logged back in to SO7 after a couple months and see AEI can anyone please explain what the AEI is and what it means please in terms of breeding?

Thanks
Darren


Thu Apr 25, 2019 8:20 am
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Group 3 winner

Joined: Wed Jun 07, 2017 3:59 pm
Posts: 674
Post Re: AEI
I think it stands for average earning index. It's used a lot in US breeding, not sure about the UK.


Thu Apr 25, 2019 8:31 am
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Handicapper

Joined: Fri Mar 30, 2007 10:46 am
Posts: 489
Post Re: AEI
There is a thread on the SO7 Beta forum, Hechicera has done some amazing work helping Mark to get this up and running


Thu Apr 25, 2019 9:12 am
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Handicapper

Joined: Thu Sep 08, 2016 3:57 pm
Posts: 481
Post Re: AEI
https://en.wikipedia.org/wiki/Average_earnings_index_(horse_racing)
http://cs.bloodhorse.com/blogs/scot/archive/2009/04/21/fast-facts-what-is-the-average-earnings-index-aei-in-thoroughbred-breeding.aspx
http://www.equineline.com/dirreffr.cfm?topic=rfaei%2Ehtm

The short is, if the average earnings of foals by all sires was £50,000 right now:
- Sire 1 had an average earnings per starter of £100,000 then his AEI is 2.0, or his foals earn, on average twice as much as stud's from all other foals.
- Sire 2 had an average earnings per starter of £5000, then his AEI is 0.1, or his foals earn 10% of the average

Which stud would you prefer to breed to?

Generally, if a stud has at least five crops racing (50+ foals game wise?) an AEI under 1.0 may be a bad thing. Unless you know he has something you can get only from him.

For game purposes, we are less interested in comparing across time (game years are much the same but real world sees some purses get bigger, some races go away). The article points out it started as comparing across time. The other breeding system in use is often the dosage system which doesn't even make sense for the game. The game only does individual sire, by year, and keeps a rolling average. Not the broodmare sire or mare stats, that requires more tracking and calculation. In case you read articles.

While the first article does point out that one or two good runners can skew that AEI, it would skew it less than the previous numbers the game used. Also included in the game are %winners from starters and %black type winners from starters. And you can see how many foals are starters in the %winners column, it shows as a fraction "20/40 (50%)" in the game. With those four numbers: number of foals to race, how they fared compared to average earnings, %winners, %stakes(black type) winners you can get a pretty good picture of a sire's record, and how likely you are to get a certain type of foal by him.

So first, has the stud had enough foals to race to be giving a full picture? If his foals earned more on average was it because of a fair number of stakes winners? or was it a few stakes winners but most foals still were as I call them "useful" runners? Those keep the lights on between bigger winners usually. Or did most of his foals leave the track without breaking their maiden, but the few that won often won stakes? High chance of a dud, but slight chance of a top winner? If two horses both have solid winner and stakes production, who's offspring wins the bigger races (higher AEI)? That should help you decide what sort of as gamble the sire is for your money at various points in the game and with different class mares.

The caveats with AEI, true in real life and game, in addition to a few big winners skewing it are: sprint sires and middle distances horses and early maturing producers often look better. More of those races have rich purses and there are more of them. Accept lower AEI's when looking at distance sires. Also, sires that throw early maturing sprinters often have very high AEIs, esp. early in their stud careers when their first two crops are racing at 2 & 3. Sire's that run on very rich circuits internationally have higher AEIs for that reason alone. You see that in the game!

It is tracked in US and UK, and globally. Though as noted in the wiki, Racing Post sometimes limits the average and offspring to more local races. So Sunday Silence (who's offspring mostly ran in Japan or nearby) has a lower AEI in Racing Post than in US-based publications. The UK runs enough races yearly to generate data without the rest of us. ;) But usually it means the global average number is used, and I think every stock SO7 schedule includes some foreign races, so that is good.

Horses with very low AEI's, even if they have good %winners from starters are probably useful sires of horses for selling races. Obv. unless a distance or late maturing producer, and/or early in sire career, or unable to attract good mares.

Is this helpful?


Thu Apr 25, 2019 11:57 pm
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