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SV%+ Calculation Poll

Posted by Neil on October 10, 2013

In case you missed it yesterday, we rolled out a couple of new goaltending stats for the 2014 season -- Save Percentage+ and Goals Saved Above Average. Overnight we got some feedback about SV%+ in particular, and the structure of having 1 minus the goalie's own SV% in the denominator of the formula. Right now, we are measuring the rate at which the league allowed more goals than the player, where 100 = average. So in the case of a 133 SV%+, the league's rate of goals allowed per shot would be 33% higher than the player's rate.

There are other alternatives. If we re-arrange the formula so that 1 minus the league SV% is in the denominator, we would be measuring the rate at which the player allowed fewer goals than the league. (Because of the nature of division, this is an important distinction from the definition in the previous paragraph.) If we tweak the formula in this direction, there are 2 options: we can compute a "minus" type of stat in which lower numbers are better, or we can stick with the "plus" style familiar to all from baseball's OPS+ and ERA+. The former would represent a goalie who allows 33% fewer goals than the league as a 67 (remember, lower is better); the latter would represent that as a 133.

(If any of this sounds familiar, it's because this battle was fought at Baseball-Reference 3 years ago and continues to rage in some corners of the internet to this day.)

As is the case sometimes in this business, there is no "right answer" here, but rather a matter of preference. For instance, we've long assumed users would find it counterintuitive to have a rate stat where lower numbers = better performance, but maybe that's not true. I'm interested in opinions on this, so let your voice be heard in the following poll -- which format do you prefer? Or do you care at all? I can't promise the poll-winning format will be what we eventually stick with, but I'd like to know what people think.

7 Comments | Posted in Announcement, Hockey-Reference.com, Polls, Stat Questions

Save Percentage+ and Goals Saved Above Average

Posted by Mike on October 9, 2013

Today on Hockey Reference we're rolling out two new stats for goalie pages: Adjusted Save Percentage (SV%+) and Goals Saved Above Average (GSAA). First, you can check Broad Street Hockey for a great explanation of adjusted save percentage and goals saved, but for a simple look, consider the 2012-13 NHL season. League-wide, there were 41,827 shots overall and 3,684 goals scored, for a goals against average of 8.81%. Vezina Trophy winner Sergei Bobrovsky had a goals against average of 6.87% -- 29% better than league average, giving him a SV%+ of 129. Taking that 29% better performance into account combined with the number of shots he faced, we say he saved 21.48 goals more than an average goalie would have, given equal playing time.

These stats are especially helpful for comparing goalies across eras: Patrick Roy led the league in save percentage in the 1991-92 season with a .914 SV%; in the 2012-2013 season that would have placed him as the 26th best goalie between Ben Scrivens and Jonas Hiller. However, we can look at his SV%+ of 130 for that year and see that he was actually 30% better than the league average at stopping goals -- better than Bobrovsky, even.

Note that SV%+ has a minimum requirement of 4 shots faced per team game, so that we don't have goalies who stopped 7 of 7 shots faced in their single period played skewing the results. These stats are now up for goalies as far back as the 1983-84 season (the first year we have shots against data for the NHL), and for the entirety of the WHA (1972-1979), and will be updated throughout the year.

5 Comments | Posted in Announcement, Hockey-Reference.com

Justin Kubatko Leaving Sports Reference

Posted by Justin Kubatko on August 20, 2013

I am sad to announce that after six years, five websites, and hundreds of thousands of lines of code, my tenure at Sports Reference will come to an end this week. More information can be found on my new blog, Statitudes. Thanks to all of the users who have supported the sites that I ran.

45 Comments | Posted in Announcement, Baseball-Reference.com, Basketball-Reference.com, CBB at Sports Reference, CFB at Sports Reference, Expire30d, expire40d, Hockey-Reference.com, Olympics at S-R, Pro-Football-Reference.com

Are you a Web Developer Who Loves Sports? Let’s Talk.

Posted by admin on August 9, 2013

Jobs @ Sports Reference.

Sports Reference has an immediate opening for a web developer. Please see our job advertisement for all of the details. We will begin reviewing applications on August 26th.

7 Comments | Posted in Advanced Stats, All-Star, Announcement, Baseball-Reference.com, Basketball-Reference.com, Bleg, CBB at Sports Reference, CFB at Sports Reference, expire21d, General, Hockey-Reference.com, Olympics at S-R, Pro-Football-Reference.com, Statgeekery

Video: S-R Stat Table SHARE Tutorial

Posted by Neil on May 13, 2013

Here's a 2-minute tutorial on how to embed professional-looking stat tables on your own blog:

Comments Off | Posted in Announcement, Baseball-Reference.com, Basketball-Reference.com, CBB at Sports Reference, CFB at Sports Reference, Features, Hockey-Reference.com, HowTo, Pro-Football-Reference.com, Tips and Tricks

Follow us on Twitter to Win a Free Baseball-Reference.com Play Index Subscription

Posted by admin on May 7, 2013

Every Monday, for the rest of the year, we'll be randomly selecting one twitter user who follows any three of our five Sports Reference Twitter accounts to receive a free Baseball-Reference.com Play Index account. If you are already a subscriber, we'll extend you for a year.

Sports Reference uses twitter to tweet out nuggets of information we find, notify users of new features, make occasional commercial messages, and generally enjoy ourselves. Here are the five Sports Reference twitter feeds:

  1. @baseball_ref: Baseball-Reference.com
  2. @bball_ref: Basketball-Reference.com
  3. @pfref: Pro-Football-Reference.com
  4. @hockey_ref: Hockey-Reference.com
  5. @sports_ref: CFB, CBB, Olympics, and Announcements for All Sites

Comments Off | Posted in Announcement, Baseball-Reference.com, Basketball-Reference.com, CBB at Sports Reference, CFB at Sports Reference, Hockey-Reference.com, Olympics at S-R, Play Index, Pro-Football-Reference.com

NHL Playoff Series Previews

Posted by Neil on April 30, 2013

In preparation for the NHL Playoffs dropping the puck tonight, we've added preview pages for each series matchup to the front page. There, you'll find season stats for all the players currently on each team, plus the season series results between the two teams, and various other vitals. Have them open on your computer or print them out while you're watching the games tonight.

Comments Off | Posted in Announcement, Features, Hockey-Reference.com

Hockey Playoff Matchups

Posted by Mike on April 29, 2013

In anticipation of the NHL playoffs, we've updated the front page for the postseason. In addition, we've added playoff matchup pages for each series, where you can see how two teams stack up against each other at a glance. These pages have listings of how the two teams fared in regular-season meetings this year (plus a link to see how they've played each other all-time) and the current series status.

Comments Off | Posted in Announcement, Hockey-Reference.com

Added Playoff Round to Player Game Finder

Posted by Mike on April 11, 2013

I've added a selector for specific playoff rounds on the Player Game Finder tool. If you select "Playoffs" under Game Type it will give you a dropdown to select a particular playoff round, should you want to, say, find hat tricks in the Stanley Cup Finals.

Comments Off | Posted in Announcement, Hockey-Reference.com

Video: S-R Stat Table SHARE Tutorial

Posted by Neil on March 12, 2013

Here's a 2-minute tutorial on how to embed professional-looking stat tables on your own blog:

Comments Off | Posted in Announcement, Baseball-Reference.com, Basketball-Reference.com, CBB at Sports Reference, CFB at Sports Reference, Features, Hockey-Reference.com, HowTo, Pro-Football-Reference.com, Tips and Tricks

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