Formula to convert industry SP to exchange prices ?

[foxwood]

I'm trying to mine some historical race data but unfortunately the data only includes official SP's and not exchange prices. I need to shift the SP's to exchange prices to identify suitable trading ranges.

I've found various formulae on the web suggesting bumping the SP by anything from 2% to 12% to get the exchange price at post time. These formulae usually apply different percentages to ranges of SP's.

Is there an established formula (or eg number of ticks increase) for this that anyone recommends ?

[LinusP]

No, but you can get BSP from timeform...

http://form.timeform.betfair.com/

[Euler]

viewtopic.php?f=2&t=7924&start=10

[foxwood]

Thanks for the pointers - should be able to get some useful real world data from that to prove the conversion is in the right ball park - much better than doing it manually

[dav3214]

Here's an article about this

http://sportspreadsheet.com/Horse_racing_value.html