Bookies, Tote and Exchanges

[pawras]

Here’s something you might find interesting

Median Overround (ISP) By Course And Number Of Runners All Race types – from 2000 onwards

If you reduce the date range to from 2010 onwards the IRE ones look a little bit better

[robnorth]

There was a significant change in the way SP was calculated during Covid in 2020 using predominantly off course market and that system has been retained, so any data before that is now largely redundant. Similarly the Tote has altered their modus operandi in recent years which has seriously reduced their favourite-longshot bias, generally follow SP now and bigger divdiends only paid in bigger fields and at major meetings (particularly those involving Word Pool).

Course market has altered significantly in recent years. There’s much less competition now and on course bookmakers generally following exchange (Betfair) prices.

[pawras]

That’s a good point, I’ve changed the date parm on the query to start from 2021 and get this

[Author]

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