Forecast Price daily vs historic

Question

Why is the forecast price in the historic_runners_beta table different to the value in the daily_runners_beta table?  I would have thought historic_runners_beta is supposed to be a copy of the daily data for analysis purposes.  This throws my algorithm out.

Answer 1

There can be discrepancies based on timing of the daily data versus historic data since forecast prices are first issued at the earliest declaration stages and can be updated post reduction in number of runners.   Where you have exactly the same number of runners in the daily data as the historic data, we would expect fewer discrepancies, if any.