Crashburn Alley makes heavy use of Sabermetrics, “the analysis of baseball through objective evidence.” Many Sabermetric analyses involve the use of non-mainstream statistics, and as such, the names and acronyms are foreign to most baseball fans. I try to do my best to spell out each statistic as I use it but every so often, I get a comment, e-mail, or even a tweet asking me to provide an explanation. In an effort to both save myself some time and encourage research, I am going to provide many resources below that will help explain many aspects of Sabermetrics. If you see a topic that isn’t covered but should be, contact me via e-mail, Twitter, or Facebook.

Sabermetric-Friendly Websites

Check out the third section of links on the blogroll on the main page. For newcomers to Sabermetrics, I recommend starting out with FanGraphs. As you become more comfortable with these statistics and methods of statistical analysis, head over to Baseball Prospectus and Tom Tango’s The Book Blog.

Also check out “Everything you always wanted to know about” series by Alex Remington at Yahoo! Sports. For more advanced Sabermetric concepts, read Lookout Landing’s Sabermetrics 101 feature.

For most of the stats to follow, I will be linking to the  Saber Library at FanGraphs, created by Steve Slowinski of DRays Bay. On each page, there are links to other pages of interest relating to each particular statistic.


On-base Plus Slugging (OPS)

Weighted On-Base Average (wOBA)

True Average (TAv)

Isolated Power (ISO)

Batting Average on Balls in Play (BABIP)

Batted ball data (GB%, LD%, FB%)

Home run per fly ball rate (HR/FB%)

Rate stats (K%, BB%)


Fielding Independent Pitching (FIP)

Expected Fielding Independent Pitching (xFIP)

Skill Interactive Earned Run Average (SIERA)

Strike Zone Earned Run Average (kwERA)

Batting average on balls in play (BABIP)

Strand Rate or Left on Base percentage (LOB%)

Batted ball data (GB%, LD%, FB%)

Home run per fly ball rate (HR/FB%)

Rate stats (K/9, BB/9)

Pitch Type Linear Weights


Defensive stats are the least trustworthy of all Sabermetric stats, but it doesn’t mean they are worthless. For specific criticisms on defensive stats as currently constructed, I recommend reading the work of Colin Wyers at Baseball Prospectus. These articles are behind a paywall, but well worth the price of admission:

Also read Myron Logan’s overview of where we’re at with defensive metrics at The Hardball Times.

Ultimate Zone Rating (UZR)

Dewan Plus-Minus (+/-)

Total Zone (TZ)


Value Over Replacement Player (VORP)

Wins Above Replacement

Wins Above Replacement Player (WARP)

Win Probability

Win Probability Added (WPA)

Leverage Index (LI)

Context-neutral wins (WPA/LI)

Win Expectancy

Pythagorean Expectation