“Expected Goals” explains how data changed football
Data led to the rise of the “long-ball” game, then to its demise
The most coveted figure in this summer’s European football-transfer window
was neither a superstar player nor a feted coach. He was a data analyst. In
just over a decade at Liverpool, Michael Edwards helped revitalise an
underperforming giant of English football. When he left the club in May, a
flurry of rivals tried unsuccessfully to sign him. His ascent is also the story of
how
football, long an anti-intellectual sport, finally realised that numbers
could sharpen a competitive edge.
Mr Edwards was not the first to study English football through data. In the
1950s an accountant called Charles Reep began tallying passes, crosses and
shots, annotating over 2,000 games and writing up his findings in the
Journal of the Royal Statistical Society. His
main conclusion was that a
team’s chances of keeping the ball fell with each pass. The implication was
that they should shoot on goal as quickly as possible. Reep is cited as an
inspiration for the grim “long-ball” style of play that took off in England in
the 1980s and peaked in Wimbledon’s victory in the fa Cup of 1988.
By the turn of the millennium, more in-game actions could be recorded more
quickly and accurately. After his on-field career was curtailed by injury, Mr
Edwards began a second one at Portsmouth in the early 2000s, combining
data and video clips to analyse the opposition. In these early days, data was
often used to berate players for their physical performance, such as how far
they had run. But as Rory Smith of the New York Times explains in “Expected
Goals”, a group of innovative firms and internet hobbyists gradually collated
more and more match data and drew more sophisticated conclusions. When
Mr Edwards went to Liverpool, he built a data department that included an
astrophysicist, a chess champion and a former researcher on the Higgs boson
at cern.
Analysts have faced plenty of resistance. Liverpool were mocked for giving
them a say in player recruitment alongside Brendan Rodgers, then the
manager. The club’s American owners decided they preferred Mr Edwards’s
empirical approach and sacked Mr Rodgers. Under his successor,
Jürgen
Klopp, canny signings saw Liverpool overhaul rivals with much deeper
pockets. “Liverpool’s success gave English football a begrudging epiphany,”
writes Mr Smith. “It is the teams who do not invest [in data] who are
considered outdated,
old-fashioned, faintly neolithic.”
Already, the adoption of analytics by most elite teams means the advantage
conferred has shrunk. The launch of giant player databases has aided due
diligence on potential signings. Tactics have changed too: long-range shots
and crosses have declined in the Premier League as data has shown they
might lead to fewer goals than many coaches realised.
Still, there is more to come. One club official tells Mr Smith that “there are
no more than a handful of teams in English football doing anything even
vaguely useful with analytics.” In its secrecy, at least,
football remains a
closed shop. Nevertheless, “Expected Goals” is an upbeat tale of openness.
Mr Edwards and others have proved there is more than one way to achieve
success—and persuaded an often, insular game to become more broad-
minded.
Essential words for writing and speaking
1.
Demise - the end of the operation or existence of something:
Huge corporate farms have led to the demise of many small, family-
owned farms.
2.
Coveted - strongly desired by many:
The Caldecott Medal is a coveted children’s book award.
3.
Revitalise - to make something grow, develop, or become successful
again:
A variety of policy initiatives have been undertaken aimed at
revitalizing the economy.
4.
Tally - a record or count of a number of things:
Make sure to keep a tally of the number of customers going in and out.
5.
Berate - to criticize or speak in an angry manner to someone:
As he left the meeting, he was berated by angry demonstrators.
6.
Begrudging - given or done unwillingly:
The concert attracted begrudging praise from the band's usually hostile
critics.
7.
Epiphany - a moment when you suddenly feel that you understand, or
suddenly become conscious of, something that is very important to you
It is a marvellous epiphany, fully rewarding the faithful reader's labour.
8.
Faintly - slightly or not strongly:
She seemed faintly embarrassed to see us there.
9.
Due diligence - the detailed examination of a company and its financial
records, done before becoming involved in a business arrangement with
it, such as buying it or selling its shares to investors:
The buyout group's due diligence is expected to run till late March.