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Most historical National Football League (NFL) analysis, both mainstream andacademic, has relied on public, play-level data to generate team and playercomparisons. Given the number of oft omitted variables that impact on-fieldresults, such as play call, game situation, and opponent strength, findingstend to be more anecdotal than actionable. With the release of player trackingdata, however, analysts can better ask and answer questions to isolate skilland strategy. In this article, we highlight the limitations of traditionalanalyses, and use a decades-old punching bag for analysts, fourth-downstrategy, as a microcosm for why tracking data is needed. Specifically, weassert that, in absence of using the precise yardage needed for a first down,past findings supporting an aggressive fourth down strategy may have beenoverstated. Next, we synthesize recent work that comprises this special Journalof Quantitative Analysis in Sports issue into player tracking data in football.Finally, we conclude with some best practices and limitations regarding usageof this data. The release of player tracking data marks a transition for theleague and its' analysts, and we hope this issue helps guide innovation infootball analytics for years to come.

Bigger data, better questions, and a return to fourth down behavior: an  introduction to a special issue on tracking data in the National football  League