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Using Player Efficiency Rating

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How to Calculate Player Efficiency Rating (PER)

Understanding how to calculate PER and use it to bet on basketball is a key step for more advanced NBA bettors.

If you’ve watched the NBA or handicapped basketball games, you’ve probably seen the stat PER referenced a few times. While you might generally know that this is an all-encompassing metric that evaluates a player’s production, you might not know all the ins and outs as to why that’s the case.

In this article, we’re going to take a look at PER, explain what it is and examine how it is useful to handicappers betting on basketball.

What Is PER?

The Player Efficiency Rating was a creation of ESPN basketball columnist John Hollinger. He was slightly ahead of his time with advanced stats in the NBA and ended up earning a job in the Memphis Grizzlies front office.

The key to this stat is to put an all-encompassing value on a player’s production. You might ask why we need such a thing, but the answer is two-fold. In baseball – which is arguably the leading sport in terms of advanced stats – they have a number called ‘WAR’ or Wins Above Replacement that’s very useful to quantify a player’s importance.

Secondly, standard stats in the NBA can be misleading as a player might score 25 points per game but simultaneously be a big liability on defense and elsewhere. PER sums up a player’s positive accomplishments and detracts the negatives produced to come up with a per-minute rating on the player’s performance on both sides of the ball.

How Is PER Calculated?

Without going all Matt Damon circa Good Will Hunting on you, (and getting into some extremely complicated mathematical equations), we’ll try to explain how Player Efficiency Ratings are calculated in the most basic of terms.

In short, we take 12 different stats available for any specific player. We weigh those stats differently (field goals made will be worth more than a defensive rebound, for example) and then plug in the player’s values in each category.

In simpler terms, PER score includes simpler statistics like field goals made, steals, three-pointers made, and then subtract things like free throws missed, turnovers, and fouls.

Hollinger has clearly given more weight to the categories that he feels are more important and given less weight to the stats that are slightly less of a factor. His numbers are widely considered to be the most accurate, and his formula has become the league-wide standard used to calculate PER.

The good news is that you never actually have to do this calculation. Every single player in the NBA has a profile page on ESPN and each of those profile pages will show the player’s PER.

The Flaws of PER

While PER is arguably the most comprehensive NBA player metric, there are some flaws to keep in mind.

First, PER is a metric just like any other mathematical model. We’ve plugged in a bunch of stats into a formula to spit out a number on a player. Quantifying performance is helpful, but it doesn’t consider intangibles like leadership or clutch scoring.

For example, does a block in the first quarter have the same value as that key block in the third quarter that sparked the momentum change and the comeback? Isn’t there a difference between a player who scores 26 points in a blowout game versus a player who scores 26 with 22 of the points going up during a fourth quarter comeback when the team needed him most?

A good example is a player like Derek Jeter in baseball, who maybe didn’t have the best stats of all-time but when he was needed – either for a key hit, a stolen base or an important defensive play – he pulled through. Many good players are good due to important intangibles that fall through the cracks of stats like PER, WAR, and others.

PER also fails to consider assisted points versus unassisted field goals. For example, let’s say a player is just scoring on alley-oops versus a player who is creating on his own opportunities.

There are catch-and-shoot players like three-point specialists that might grade out well here, but they’re not the same as someone who can drive, slash, and break down a defense to create their own shot. PER doesn’t distinguish between the two. Stats like APER have since been created to address these shortcomings.

How Calculating PER Helps You Handicap Basketball Games

Now that you have a good idea of what PER is, why is it important for handicapping?

It’s a fair question considering basketball is a team sport and PER is an individual metric. What are we supposed to do: add the total PER of both teams and bet on the team that has the highest collective PER? Of course not.

A metric like PER can be very useful to basketball handicappers in the right situation. Naturally, the mind will go to props and that’s exactly where it can be quite useful. Sportsbooks will post player props on many NBA games, so you can look at their individual over-under and cross-reference it with the PER to see whether you find some value there. We don’t advocate relying on PER alone, but it’s a key component of complete diet looking at points per game, rebounds per game, and more to get a full picture of the player.

Head-to-head player matchups also benefit from considering PER. Let’s say you’re considering a head-to-head wager on total points, rebounds, and assists between Joel Embiid and Andre Drummond. PER efficiency might give you a picture of who is the better bet.

The Best Time to Use PER

However, arguably the best use for PER in basketball betting is determining the value of injuries. Often a player might sit out with load management or with some type of injury and while we see the betting line get adjusted, we’re not always sure how much value that player adds or subtracts with their presence.

Sure, it’s clear that if LeBron James plays or doesn’t, it will have a huge impact. But what about a role player who comes off the bench or a good rebounder? Is that a big loss or can the team survive the night without them? PER will typically uncover the value of players who are otherwise overlooked. These conclusions can provide an edge on the spread, moneyline, or total.

A great example is the Los Angeles Clippers in the 2019-20 season. Obviously, someone like Kawhi Leonard key to their success. But who would figure that center Ivica Zubac would have a PER  (21.00) that was higher than Paul George’s (20.84)?

This realization doesn’t necessarily mean he’s a better player, but it does tell you that Zubac’s absence can have a bigger impact on the game and betting line than you might think.

Keep an Eye on PER

Now that you have a better understanding of how to calculate PER and why it’s useful for handicapping basketball, you’ll know what to do with the numbers when you see them.

For more articles like this, visit our how-to section to keep advancing your sports betting knowledge.

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For over 8 years, Dave has been working in mainstream media and sports betting.

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