Each and every race is different. Tomorrow's races will be different to today's and everything before now. Humans however do work in reasonably set patterns. Using the patterns as a precursor may give enough of an edge. So I am trying to see what the relationship of the oncourse is to betfair and the tote.
If I can get the PP and match that in as well will be great.
Purists will say that you need exact data. That is only going to produce possible for today's events at a cost exceeding reward. Thus I understand that the data available is not 100% correct, it is reasonably correct. In the last 6 mths we have see that a lot of the corps that have recorded the oncourse prices have often missed the last call.

My thoughts are that laying is better than betting. Betting is hard work. but knowing the trends in the market will help me with the laying. ie we can check the value of the fav that is the PP, OP, BF, Bookies and tote fav. And we can see the value of openers that open equal or more than the PP. etc