Interesting angle. Very opportune for me as I was just having a web scraper updated for the oncourse bookies data. I had added open price rank, Fluc count,SP rank. Now I have added price difference, rank difference and probability difference. I am noticing that although there there may or may not be a price difference, the probability has altered differently as the market has come from a 145% opening market down to a 120% starting market. To get the probability difference I converted to 100% in both the OP and SP market. Very early days yet as I am just using the trial version but a simple scan is showing things in a clearer light.
To the point, you may want to consider adding more if possible before you start the download and analysis stage.

Shhhh!!!.....don't give everything away Wally

Mate, rather than web scrape, have you tried Dynamic Odds. You get all that for a $1 a day and downloadable to excel (not that I've been able to achieve that yet, but that's another story, email me) plus years of historical data.

I am confused, is this supposed to be a live events feed or just as a database?

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