Sports analytics

The MLB has set the benchmark in sports analytics for a number of years, with some of the game's brightest minds having never stepped foot into the heat of a major or minor league baseball game. Theo Epstein of the Chicago Cubs is one of those minds who has never suited up in a professional baseball game; instead Epstein relies on his Yale University education and the numbers behind the game to make many of his decisions.[3] Epstein, known for his role in ending two of baseball's most historic streaks (the Boston Red Sox curse of the Great Bambino in 2004, and as recently as the 2016 World Series, helping end the 108-year drought between World Series wins for the Chicago Cubs), is a member of a growing community in major league baseball who do not rely on years of major league playing experience. This community has been able to grow thanks to the in depth collection of statistics that has existed in baseball for decades. With analytics being relatively common in the MLB, there are a breadth of statistics that have become vital in the analysis of the game, which include:

• Batting average is one of the most commonly discussed statistics in baseball. A players batting average is determined by dividing hits by the number of at bats that players have. The use of statistics also provides players with different pitches they struggle with at the plate, it shows their tendencies and which pitch usually strikes them out.[4]
• On-base percentage is the percentage of times a player reaches base on either a hit, walk, or by being hit by a pitch. This is a significant offensive stat as it looks beyond hits and more importantly illustrates how often a batter can avoid being put out at the plate. This is a more in depth offensive statistic than batting average as it takes into account walks and being hit by a pitch, both of which are indicators of how a player handles an at bat. Sabermetrics can help change a player's approach in order to raise their own base percentage increasing productivity and ultimately their overall worth as a player.[5]
• Slugging average is the calculation that determines the number of bases a player earns on hits. To determine this stat, the number of bases earned is divided by the number of at bats. This is a good measure for measuring a batters power as the higher their slugging average is, the more likely they are to hit for extra bases (i.e. a double, triple or homerun). For sluggers, analytics can help them improve decision making at the plate and look for their pitch. Now, hitters can study the tendencies of the pitchers they are going to face therefore familiarizing themselves before they are up to bat.[6]
• WHIP stands for Walks plus Hits allowed per Inning Pitched and tends to be viewed as a strong way to measure the success of a pitcher as it illustrates how many baserunners the pitcher allows on both hits and walks. This is also a proven method for looking at a pitcher's efficiency. Now, pitchers can study the upcoming lineup they are going to face and focus on tendencies of the batters. Like where they stand on the plate, what pitches they tend to chase, and what part of the field they like to hit.[7][8]

The NHL has kept statistics since its inception, yet it is a relatively new adopter of analytics-based decision making. The Toronto Maple Leafs were the first team in the NHL to hire a member of management with a largely analytical background when they hired assistant general manager, Kyle Dubas, in 2014. Dubas, similar to Theo Epstein in the MLB, has never suited up in a professional game and relies on the numbers generated by players on a nightly basis both now and in the past to make decisions.[9]

• The Corsi statistic is an advanced statistic that has been widely adopted throughout the NHL, as teams, fans and media alike rely on the Corsi statistic to track shot attempt differential.[10] Corsi has been recognized as the most informative single statistic in the game of hockey as it can provide insight into both the offensive and defensive play of a team as well as the amount of time a team has possession of the puck.[11]

The PGA Tour collects vast amounts of data throughout the season. These statistics track each shot a player takes in tournament play, collecting information on how far the ball travels and exactly where each shot is played from and where it finishes. These data have been used for a number of years by players and their coaches during practice sessions as well as during tournament preparation, highlighting the areas in which that player needs to improve before teeing it up in tournament play.

• Shotlink data collection has revolutionized the way that data is collected in the game of golf. Introduced on a full-time basis in 2003, Shotlink relies on a number of strategically placed on-course laser rangefinders and cameras to collect precise data from every shot that is struck on the PGA Tour.[12] With these data, players are able to see the areas of their game that need improving, and on a broader year-to-year basis, players can review course statistics from previous years to allow for relevant tournament preparation. On top of the year-to-year stats provided players and fans can also easily access these statistics at an up to the minute rate, giving these data an extremely high velocity. Shotlink has also made its mark on the world of golf course design as designers have constant access to up to the minute statistics of professional golfers, allowing for these designers to create courses that can provide a challenge for the world's best players.[12]

The Astros rely heavily on analytics when making decisions. The team has employees with titles like, director of decision sciences, medical risk manager and mathematic modeler.[15] Unlike other professional teams who typically use analytics solely for player transactions and signings, the Astros have begun to use analytics to make decisions on how they will play on the field, "applying the defensive shift more than any other team in the MLB last season."[15] Using this approach, the Houston Astros captured their first World Series victory in franchise history in 2017.[16]

One of the early adopters of SportVU, the San Antonio Spurs have been using analytics to gain a competitive advantage on opponents for a number of years. Collectively as a team the Spurs have honed in on the importance of the three pointer and as a result constantly rank among the league lead in three point attempts. The teams understanding of the importance of the "three" extends beyond the offensive side of the court as they are relentless at defending the three pointer in the defensive end of the court.[15]

In 2009 the Chicago Blackhawks turned to an outside company to produce analytical assessments for them.[15] Subsequently, the Blackhawks have achieved unparalleled success in the NHL, winning three Stanley Cups in six seasons. With this success has come a number of difficult decisions for Blackhawks management as they are often only able to hang onto a core group of players following each cup run, while other key players receive offers that the Blackhawks simply cannot match under the NHL's salary cap. However, by using this analytics based system, the team has continuously been able to fill these gaps by finding players who are undervalued by other teams but will fit well with the Blackhawks' style of play. This process has been refined by the Blackhawks who provide yet another example of the longevity that can be associated with analytic base decision making.[17]