Book Percentage - anywhere?

[Burdett]

Hello

Is anyone familiar with where you could get the Book Percentage?

I want to test a market odds for its competitiveness, before proceeding to place a wager. As the book fills, the odds near to 100%. Looking at distant horse races, yet to fill with competitive orders - its possible to see Book Percentages in their 1000's. You can field out poor odds by testing the odds themselves, but I thought better than this, is to overview the competitiveness of the book overall.

Any assistance, much appreciated.

David.

[Franklin1]

It's not given in the API, you need to calculate it yourself

[JayBee]

For the Back overround sum the reciprocals of each entrant's back odds and multiply by 100.

e.g.

2.0 = 1/2 = 0.5
3.0 = 1/3 = 0.333...
5.0 = 1/5 = 0.2

sum = 1.033

% = 103.3%

That and more in my book (endorsed by Betfair) - See link below

Hello

Is anyone familiar with where you could get the Book Percentage?

I want to test a market odds for its competitiveness, before proceeding to place a wager. As the book fills, the odds near to 100%. Looking at distant horse races, yet to fill with competitive orders - its possible to see Book Percentages in their 1000's. You can field out poor odds by testing the odds themselves, but I thought better than this, is to overview the competitiveness of the book overall.

Any assistance, much appreciated.

David.