Save Time - The Maths is Done For You
As well as being a trader, I am a mathematician, statistician, and data analyst.
I have created many calculators for my own use.
For the first time, I am sharing my calculators.
I've Done the Maths - So You Don't Have To!
Calculator Instructions
The calculator below gives accurate results both pre-match and in-play, as long as the match score is 0-0.
This calculator doesn't know who the teams are, whether the match is a league, cup, international or friendly.
Incredibly, it can generate a set of odds for correct scores and over/under 2.5 goals that are almost identical to the Betfair odds.
It would be impossible to for a calculator to do this, if the Betfair odds didn't follow a predictable pattern.
If you can price a match, you have the potential to find value.
If Man City are playing Arsenal, we all know that Man City would be favourite.
That is not the issue.
The issue is could you estimate the exact odds and feel comfortable that your odds are in the ballpark?
My Poisson-based calculators will do all that work for you.
When you don't know what the real odds should be, you feel confused.
The aim of my calculators is to remove the confusion, so that you can get on with your form analysis.
Poisson Distribution Explained
The Poisson distribution was derived by French mathematician Siméon Denis Poisson.
You've probably heard of a normal distribution. A Poisson distribution is another type of distribution.
The Poisson distribution is based on each team's expected goals and attack and defence strength.
The Poisson distribution shows the probability of a given number of goals occurring in a fixed interval of time.
Once you have put the team names into the demo calculator, you will see a Poisson distribution graph when you scroll down to the bottom of the calculator.
Poisson Calculator Instructions
You can use up to 5 years of data. I usually use as much data as is relavant. This may seem counter-intuitive, as most people believe that recent form is most important.
Many research papers have concluded that Poisson has shown a profit.
All of these researchers used a massive amount of data and none of them took recent form into consideration.
Once you have put the team names into the calculator, a tab will appear at the top.
Using the tabs, you can look at recent form by looking at:
For the last 6 matches, teams are given a rating that is based on the expected number of points and the actual points won. The expected points is based on probabilities, derived from average bookmakers' odds for each match.
Once you get used to looking at long-term form and recent form separately, you will see that the bookmakers' odds are based mainly on long-term performance of teams.
Occasionally, the Poisson formula overestimates the number of goals. This is usually when very weak teams are involved in the match.
I created a formula that solves this issue.
When you put the 0-0 (that you see on Betfair) into the calculator, you will get a list of odds that are more in line with the real odds.
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