What exactly is SP?

[osknows]

If I tick the SP in additional columns from the Excel/Log current prices what is this exactly?

Is it the actual SP provided by Betfair or a calculation by BA?

I notice that it updates before an event then locks once market goes into play. Does anyone have any experience of how accurate this SP is?

Thanks,
Os

[GaryRussell]

It is the forecast SP price based on SP bets already placed. It is the same as you can view on the website.

See http://promo.betfair.com/betfairsp/FAQs_theBasics.html for Betfair's explanation.

[milfor]

Before the event it is only a projection what the SP might be. This projection comes from Betfair and can be seen on the webpage as well.
When the event goes in play the exact SP price is shown.

[osknows]

Thank you