This belong here also:
In his book, Billy Walters has a system for calculating the strength of his plays. It is a "star system" but really just another way of calculating EV. He has a chart called "The Relative Value Of Each Point, NFL." You'll find the chart below. This is the chart that shows the chances of exactly hitting the spread. which we've had on here earlier. His "star system" looks like this. The higher the percentage the more he bets.:
5.5% = .5 star
7% = 1 star
9% = 1.5 stars
11% = 2 stars
13% = 2.5 stars
15% = 3 stars
So if Walters had a power ratings differential of 2.5 and the line is -4 he has a 1.5 star bet. This is how he calculates it. There are two pertinent numbers between his power ratings differential, 2.5, and the -4 line, the numbers 3 and 4. If his team loses by 3 he wins the bet. If his team loses by 4 he pushes the bet.
So from the chart he takes the 8% that the 3 is worth and adds half the value of the 4, 1.5% to it. So at 9.5% its a 1.5 star bet.
Looks like calculating EV to me.
Reply With Quote