Complete baseball stats, with player and team rankings.
XERA-Baseball.com
Mathematics in Baseball:
The Science of the Art
Featuring:
XERA - Baseball's statistical scouting report
. . . and standard stats, too. XERA measures the productivity of any player or
team by calculating a
normal distribution of traditional baseball numbers. It's backed up by
100 league-seasons of data, optimized through linear programming analysis.
☼
If you're not yet familiar with XERA, we suggest clicking this link
►►►
XERA Objectives to learn more.
A free link to all the XERA Hitting
and Pitching formulas is at the bottom of that page.
☼
Then check out this link
►►►
XERA History
to see how well it's worked over the years - always using the SAME
formulas.
Feel free to compare XERA to actual data - no other sabermetric system
evaluates the production of (offensive AND defensive) earned runs more
accurately.
Quick Click Links===>
Various
XERA Stat Sheets
Standings
and Ranks
Baseball trivia page Easy
Money
SIX OF THE TOP SEVEN XERA-RATED TEAMS MADE THE
PLAYOFFS IN 2009! The
♦
symbol below (next to
Updated twice weekly), starts the paragraph that shows you how to
get to those ratings. Remember, these ratings are purely mathematical, not
subjective.
The
Easy Money
link was 7-for-10 in the 2009 post season . . . for the
sixth straight year!
Contact us at
xerastats@gmail.com.
We've added a new
category to our
Various XERA Stat Sheets
Quick
Click Links
- the
Changes
tab - to see how the game has changed, statistically, over the years.
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XERA-Baseball.com is a free website. We want to keep it that way.
Many thanks to the wonderful folks at Amazon.com for
making this possible.
Updated daily:
Standings and Ranks
through Thursday. This page
shows
detailed 2010 MLB standings, runs scored, opponents runs scored, and Runs2
standings. We also show runs scored/allowed on a per-game basis. We have
magic numbers
for each division leader, and mathematically projected full-season wins
for each team, from the beginning of the season. The
Runs2
tab has been moved to the Standings and Ranks workbook. See why
runs2 reflects so well on a team's record. The AL
outperformed the NL by 16 games, and 70 runs, in inter-league competition for
2010.
Updated daily:
We have complete 2010 XERA and standard stats on all hitters
(non-pitchers) with 15 or more PA, and pitchers with 4 or more IP -
1011
players through Thursday.
Click
this (the
Various XERA Stat Sheets
Quick Click Link), and then just click the
Hitters10
tab or the Pitchers10 tab.
The complete stats involve extracting information from 3 databases. That
information is then correlated to existing formulas on Excel spreadsheets, and
sorted. This year, we're including the Scouting Report "Grades" from the start.
♦Updated
twice weekly: Be sure to check out the
2010MLB
tab in the
Various XERA Stat Sheets
section, as well, for XERA Rankings of each team,
based on the collective XERAs of each team's players.
Last
update: Games through Monday, July 26, 2010.
This feature now includes XERA grade
ratings. Generally, speaking the grade ratings will be fairly consistent with
the grade ratings in the
Standings and Ranks
section. Because XERA ratings are based on a normal distribution of
accumulated player stats, not just actual runs and runs-allowed per game, it
takes on additional meaning. When there is a significant difference between the
two grades, look for the rankings to mutate toward the XERA grade over time.
We use, and highly recommend, Lee Sinins'
Complete Baseball Encyclopedia
(an unsolicited endorsement of my favorite source of baseball stats) as our
reference for traditional baseball stats.
The Computer Annex of Sarasota
has honored us (GillXL, LLC) with its “Excellence in Excel” award, again in
2010 - our third consecutive year of that honor. This year, new applications
used in this XERA website, along with binomial and hypergeometric
distribution worksheets were cited as the reasons for that honor. THANK
YOU!
The same techniques that developed XERA and its related formulas, can be
used very effectively in business, for cost analysis, quality control,
estimating, etc. If you'd like to optimize formulas or data for your
business, GillXL, LLC can do it for you, as well as translate and reformat
virtually any database file (even text-based) into a sortable Excel
application. Please contact us at
xerastats@gmail.com. This website and all its associated formulas and
stats, are by GillXL, LLC personnel.
Scroll down to the list
with the light-blue background (like this) to find more details about the
various baseball stats reports on this website.
THIS
symbol (throughout the text) will link to a variety of unique sabermetric
material. These pages should provide a good overview of XERA and other
useful baseball stats.
All the XERA reports are available in
Excel format for
FREE! The Excel files give you much more flexibility than the
website - headings and sortability, for example. This is the way to transfer any
of our spreadsheet links (or anyone else's) to your Excel files:
Highlight what you want to transfer, by clicking and dragging, from your
choice of a spreadsheet link. You can highlight the whole page, if you'd like.
Copy
that data by holding the Control key (Ctrl) and clicking C.
Open your choice of an Excel worksheet. Place the curser in the top left cell of
where you want to paste it. Hold the Alternate key (Alt) and click
E. Then click S (by itself), then
Enter
(HTML or Text - whichever works best on your computer).
Yes, this is a unique baseball site. We also recommend
www.baseball-reference.com,
www.retrosheet.org, and the aforementioned Lee Sinins' Complete
Baseball Encyclopedia
(CBE) as outstanding baseball references. The CBE web address is
www.baseball-encyclopedia.com.

We plan to offer updated information that was originally published in
Mathematics in Baseball : The
Science of the Art, by
statistician Dwight Gill (a member of American Mensa) and sports writer Tad
Reeve, just before the spring of 1989 and updated years later (XERA formulas are
occasionally given small revisions to accommodate new information) by Dwight
Gill. XERA (eXpected Earned Run Average) is baseball's statistical scouting
report. At the completion of the 2009 season, we had one-hundred league-seasons
of data (1960-2009 AL and NL data) to verify XERA's accuracy and comprehensive
nature. All the formulas were developed by Dwight Gill. Ron Shandler uses the
original copyrighted formula in his annual
Fantasy Baseball book. The original XERA book is no longer in print (because
of its season-specific nature), but many of its concepts have been assimilated
by major league teams - especially to statistically evaluate players. The
New York Mets
used then-updated XERA formulas during the 2004 season and after. The newer
formulas have the same level of precision as the originals, and are easier to
calculate. No "normalizing factor" is used in the current XERA formulas, the
same
equations are used every year. XERA invites comparisons to any other
systems, or actual data. Click
THIS
to see why.
Click
THIS to go to the page that introduces XERA -
Baseball's Statistical Scouting Report:
The key to XERA: XERA (eXpected Earned Run Average)
itself, is a provably accurate mathematical technique that measures all players
(including hitters) on a scale that is familiar to every baseball fan - ERA or
Earned Run Average. XERA not only measures the productivity of a player,
much like Bill James's and Pete Palmer's methodologies, it also breaks down
standard baseball stats into a "scouting report" that clearly demonstrates
specific strengths and weaknesses of each player.
We'll also be showing a number of other
baseball-related statistics, in addition to XERA. Our baseball statistics
are based on the science that deals with the analysis and interpretation of
numerical data, that uses mathematical theories of probability, not merely
the data itself.
The
Various XERA Stat Sheets
Quick Link, and then the appropriate tab will lead to various XERA
baseball reports . . .
1)
2010 MLB
tab to see XERA, and plenty of conventional stats, for every 2010 major
league team.
2)
2009 MLB
tab to see XERA, and plenty of conventional stats, for every 2009 major
league team.
3)
2008 MLB
tab to see XERA, and plenty of conventional stats, for every 2008 major
league team.
4)
2007 MLB
tab to see XERA, and plenty of conventional stats, for every 2007 major
league team.
5)
Hitters10
tab to see XERA, and plenty of conventional stats, for the hitters of
2010.
6)
Hitters09
tab to see XERA, and plenty of conventional stats, for the hitters of
2009.
7)
Pitchers10
tab to see XERA, and plenty of conventional stats, for the pitchers of
2010.
8)
Pitchers09
tab to see XERA, and plenty of conventional stats, for the pitchers of
2009.
9) LeftRight tab
to see how XERA
makes it possible to determine the true (run-scoring) effects of the lefty/righty
theory with final 2007, and 2006 stats.
10)
Grt Hitters tab to see
XERA
demonstrate the skills of 400 of baseball's greatest hitters (career, all time)
. . .
11)
Grt Pitchers tab to see
XERA
demonstrate the skills of 263 of baseball's greatest pitchers (all pitchers with
150 wins or saves, career, all time) . . .
12) 20W
Seasons
tab to see detailed XERA
data, and standard stats, for all 805 20-game winners since the 1900
season.
13) H
Seasons
tab to see how detailed
XERA
data, and standard stats, for 600 of the best hitting seasons in
baseball history.
14) BarryB
tab to see a detailed
year-by-year XERA breakdown of Barry Bonds' incredible career -
before 2000 and after . . . This guy got dramatically BETTER after he
turned 35 . . . or was it the steroids? In response to a number of requests,
we've added tabs for the the careers of Hank
Aaron
and Babe
Ruth,
as well.
15) Changes
tab to see, by the numbers,
how the game has changed over the years. Easily find the eras when pitching
dominated the game, when power entered the game, when high batting averages were
the norm . . .
Got questions (or suggestions, or comments)? Check it out on one of the pages
of this website, or contact us at
xerastats@gmail.com. We want to provide baseball fans, and professionals,
with useful, interesting and unique information. Click
THIS
to check out the answers to your early questions.
Anthony Perri of
Baseball Fantasy and Insider Baseball fame, has a fine article about
XERA at
http://www.insiderbaseball.com/blog/2007/02/expected_era_xera.html.
Thanks Anthony! The current formulas, above (in the red-bordered section), are
even better.