Sports Reference Blog

Archive for September, 2023

Team Turnover Coverage Extended Back Three More Seasons

29th September 2023

While player turnovers have only been officially tracked in NBA games since 1977-78, team turnovers have been tracked in official scorer's reports for nearly a decade longer. Per the official NBA Guide, team turnovers have been compiled since 1970-71. However, the official NBA Guide also only shows team and opponent turnovers comprehensively since 1973-74. Team and opponent turnover totals for the 1970-71, 1971-72 and 1972-73 seasons have always been a bit of a mystery. Ostensibly the NBA has these totals, but for some reason they have never been printed in NBA Guides.

Well, we're proud to announce that this mystery has been solved and there's one man to thank: Harvey Pollack.

Read the rest of this entry

Posted in Announcement,, Data, Stat Questions | No Comments »

FBref Adds Advanced Data for Six New Leagues so the Next 8 Becomes the Next 14

27th September 2023

We are pleased to announce that our partnership with Stats Perform Opta has expanded to include six new leagues of advanced data.  This data not only includes the current seasons, but also 3-4 historical seasons.

The new leagues are

These pair with

  • England's Championship
  • United States and Canada's MLS
  • Mexico's Liga MX
  • Brazil's Serie A
  • The Netherlands' Eredivisie
  • Portugal's Primeira Liga
  • Conmebol's Copa Libertadores
  • UEFA's Europa Conference League

To form our Next 14 tier for scouting reports and the like.   This is all described on our scouting reports explainer.

Thank you for your support.  It allows use to expand our stats in more directions and continue to serve you better.

Posted in Announcement, FBref, Statgeekery, Uncategorized | No Comments »

Season-Level Time on Ice Added Back to 1997-98

25th September 2023

Hockey Reference recently extended its season-level Time on Ice coverage back through the 1997-98 season. Before this update, our coverage went back to the 1998-99 season. In conjunction with this update, we also cleaned up many season-level Time on Ice totals from 1998-99 through 2007-08 that were discrepant with the game-level totals. Our season-level TOI now matches the sum of our game-level TOI, which was first recorded in 1997-98. You can see the 1997-98 NHL Time on Ice leaders here (Ray Bourque led the league).

Posted in Announcement, Data, | No Comments »

Success Rate Comes to Pro Football Reference!

1st September 2023

We've added a brand new stat to PFR. It's Success Rate, one of the coolest and most interesting new advanced stats to enter the football discussion in the last few years.

Success Rate starts with the idea that not all plays in football have the same objective. On first and 10, a two-yard run would be considered a bad result; on third and one, that same two-yard run would be celebrated for moving the chains. This means we can't just use stats like yards to measure how effective an offense is. Instead, Success Rate shows us how effective players and teams are at staying on schedule and creating productive plays.

As a result, a successful play depends on the context. We define it as a play that gains at least 40% of yards required on 1st down, 60% of yards required on 2nd down, and 100% on 3rd or 4th down.

As mentioned, it can be measured for both players and teams, for passing, rushing, and receiving. For example, here are the leaders in 2022 in rushing yards per attempt:


Rushing Table
Rk Player Tm Y/A
1 Justin Fields CHI 7.1
2 Lamar Jackson BAL 6.8
3 Josh Allen* BUF 6.1
4 Daniel Jones NYG 5.9
5 Khalil Herbert CHI 5.7
6 Aaron Jones GNB 5.3
7 Tony Pollard* DAL 5.2
Provided by View Original Table
Generated 8/31/2023.

And here are the leaders in rushing success rate:


Rushing Table
Rk Player Tm Succ%
1 Lamar Jackson BAL 64.3
2 Josh Allen* BUF 61.3
3 Cordarrelle Patterson ATL 60.4
4 Jalen Hurts* PHI 59.4
5 Daniel Jones NYG 59.2
6 Josh Jacobs*+ LVR 57.4
7 Isiah Pacheco KAN 57.1
Provided by View Original Table
Generated 8/31/2023.

There's some overlap, of course, but also some key differences. Josh Jacobs averaged 4.9 yards per attempt, outside the top 10, but situationally he was one of the best RBs in the league last year. Meanwhile, Justin Fields averaged the most yards per attempt, but his scrambles and designed runs were less effective at keeping the team on schedule than QBs like Lamar Jackson, Josh Allen, or Jalen Hurts.

Success rate is also in Stathead! Our historical data goes back to 1994, when we first have play-by-play data to calculate this, so you can look up career leaders, single season leaders, rookie leaders, single-game leaders, and more.

This was one of our most requested adds; we love user feedback! If there's something you'd like to see on the site, please let us know!

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