An example is as follows: Take Copy Our Bets Review the runners "Last Start", now this can range from anywhere from first to ninth or even did not finish. Now take as may races as you can obtain information for, as a guide you should be back testing against at least 200 races. Now see how many times the "Last Start" variable i.e. First, actually came first in those 200 races. This may give you a result of say 20 times, therefore you have a statistical probability of a "Last Start" variable providing you with a 10% win rate. OK that is your first statistical Probability to work with.
If you want to learn how to handicap a horse race and find horses ready to win, or if you want to know when a horse will run a good race, there are a few steps you can take. Like everything else we do in life, there is a right way and many wrong ways to go about looking for good bets. Let's talk about the most important step or lesson first. I am talking about your plan.