How to Measure True Skill in Sports Betting ?

In the world of sports betting, evaluating the performance and true skill of a bettor relies on several analytical methods. Some indicators, such as Return on Investment (ROI) or Closing Line Value (CLV), are often used to measure the accuracy of predictions. But is that enough? Other factors, such as intuition, empirical analysis, and risk management, also play a crucial role.

This guide explores different ways to assess a bettor’s actual skill, relying on statistical data and concepts from the professional betting world.

Empirical Evidence and Intuitive Data in Betting

For a large volume of bets, we can calculate a probability value (p-value) that indicates the likelihood that a series of results occurred by pure chance. By inputting our ROI percentage, average odds taken, and the number of bets placed into a p-value calculator, we can determine the probability that our results are due to chance.

In statistics, a p-value below 0.05 means we can reject the null hypothesis, which in our case implies that it is highly unlikely that our results are due to chance.

P-values do not directly measure a bettor’s skill, but some expert bettors can quantify uncertainty with precision. In my book Hypnotised By Numbers, I explain how many professional bettors possess risk intelligence, enabling them to quickly analyze empirical data and predict probabilities for future events.

Their brains function like a computer, storing vast amounts of information from their observations of the sports they bet on. They accumulate hours of analysis and often specialize in specific sports and markets.

After all, aren’t accumulated experiences a form of data? Our decisions are largely based on experience built up over time.

Is Handicapping the Best Skill in Sports Betting ?

The best bettors are not always the most well-known. The size of your stakes does not necessarily reflect your skill as a bettor. In poker, some of the best players play at low-stakes tables. In sports betting, true skill is measured by how much you beat the odds, including the bookmaker’s margin.

The ultimate measure of skill in sports betting is your long-term ROI percentage. The closer your ROI aligns with your Expected Value (EV), the greater your advantage over bookmakers.

The best bettors calculate their own odds and identify market inefficiencies, adopting a "bottom-up" approach.

Closing Line Value (CLV) in Sports Betting

CLV is another way to measure performance and skill in sports betting. It is calculated using the following formula:

[(Odds taken - Closing odds)/Closing odds)] x 100

“Steam Chasers” exploit this metric using odds comparison software without necessarily possessing sports expertise.

However, CLV does not always correlate with Expected Value (EV), especially in niche markets. A ROI that matches EV remains the best proof of skill.

Managing Risk in Sports Betting

Having an edge on the odds is not enough; risk management is also essential. The Kelly formula is an optimal staking strategy:

Where:

F is the fraction of the bankroll to bet

b is the net odds

p is the probability of winning

q is the probability of losing (1-p)

Adjusting to 30% Kelly is recommended to limit volatility.

Conclusion

ROI remains the best indicator of performance in sports betting. If our ROI matches our EV over a significant sample of bets, we can be sure that our success is based on real skill.

Placing positive expectation bets consistently with an efficient staking plan ensures long-term success. Finally, leaving a margin of error when evaluating odds provides additional security in a betting strategy.