dear woof,I am considering using a single rating number. Even when these are standardised to a number out of 100 this number is not necessarily the percentage chance the horse has of winning. this is precisely the problem. Many different ratings are available. Don Scott appears to use a weight rating which is converted to a probability using a particular scale. If I wanted to, for example change techform ratings to a probability or a price, it is not obvious how to do this. The idea would be to use this price to determine value-Value bets would occur if the available price was significantly greater than the calculated price. Most punters do this by intuition- I want to use maths.