Emory mathematician
Skip Garibaldi (above in a classroom) helped do the math for a Palm
Beach Post investigation of suspicious wins in the Florida Lottery.
Garibaldi has since started eyeing data from the Georgia
Lottery.
When investigative
reporter Lawrence Mower decided to dig into public records for the
winners of the Florida Lottery, he noticed an intriguing pattern.
Over a decade, a few names kept popping up as winners of all kinds
of games. The most prolific of these winners, according to the
lottery data, was a man who claimed an incredible 252 prizes during
six years, for a total take of $719,000.
But when Mower asked
a Florida lottery official about what seemed like a suspicious
number of repeat wins by some players he was told that they could
just be lucky.
但是,当莫厄尔把这个情况向佛罗里达州彩票机构反映时,机构的回答却是“那只是运气而已”。
Mower and his
colleagues at the Palm Beach Post wanted to find out exactly how
lucky these dominant players were, but they needed help calculating
the odds.
"I starting looking
for a mathematician who had dealt with odds and the lottery," Mower
says. "That's how I found Skip."
莫厄尔开始寻找精通概率的数学家,于是找到了斯基普。
Skip Garibaldi, a
professor in Emory's Department of Mathematics and Computer Science
and associate director of UCLA's Institute for Pure and Applied
Mathematics, was happy to work on the project.
"It was like a dream
come true," says Garibaldi, whose previous research on lotteries
received the Lester R. Ford Award for mathematics and is the
subject of a chapter in the popular book Brain Trust by Garth
Sundem. Garibaldi enjoys breaking down complex math for the general
public and has appeared on 20/20, CNN and Fox &
Friends.
他说“就好像是美梦成真”!加里波第之前对彩票的研究曾经荣获过美国数学协会颁发的福特奖(Lester
R. Ford Award)。他擅长把复杂的数学问题大众化,曾经上过有线新闻网(CNN)以及《20/20》、《福克斯和朋友们》(Fox
& Friends)等电视节目。
"I get this call from
Lawrence, and he says, 'I have this huge database I'd like to feed
you of everyone who has won more than a $600 prize in the Florida
Lottery over a decade," Garibaldi recalls.
Philip Stark, a
statistician from the University of California, Berkeley, and
Richard Arratia, a probabilist from the University of Southern
California, were also recruited to work with Garibaldi on the
project. The three mathematicians are now writing an academic paper
that will explain their lottery findings in more technical
detail.
Two of the underlying
principles for the lottery analysis were probability theory and the
law of large numbers, which both trace their beginnings to a
16th-century Italian mathematician, Gerolamo Cardano. In fact, it
was his love of dice games and other forms of gambling that sparked
Cardano to work on probability questions.
"The subtle point
about probability or quantum mechanics," Garibaldi says, "is that
there are things that we know are possible and we can calculate the
probability of them happening, but they are so unlikely that no one
has seen them happen and likely no one ever will. For this lottery
question, something that happens to fewer than one-in-20-trillion
lottery gamblers is one of these utterly implausible
events."
Using this generous
bar for random luck, the analysis identified winners who were
defying the odds during the past decade, and would have had to lose
prodigious amounts of money to win so many times. The most prolific
winner, for instance, would have had to spend an estimated minimum
of $2.07 million to have a one-in-20-trillion shot at his 252 wins
and winnings of $719,051, for a net loss of about $2.35
million.
"But even if every
single citizen in the state of Florida spent $2 million on lottery
tickets," Garibaldi says, "the odds are less than one in a million
that anybody would have won that many times."
These kinds of
figures "put us in pretty safe territory with our suspicions that
something was amiss," Garibaldi says.
他说这些数据分析,让我们能很有把握地怀疑,事情很不对劲儿。
The mathematical
analysis was also able to identify winners of multiple prizes who
appeared to be legitimate gamblers. "The fact that a person claims
multiple prizes does not necessarily indicate that they are doing
anything suspicious," Garibaldi says. "A finer analysis and more
inspection can show that some people are likely just spending a lot
of money on tickets and occasionally getting lucky."
"The math was the
critical part of this story," Mower says of the package of
investigative pieces published on Sunday, March 30. "It's been
really valuable working with Skip because he'll see something that
I won't."
On Monday, March 31,
the state legislature called for more oversight of the Florida
Lottery. On Tuesday, the lottery announced that it would adopt
safeguards, such as software to track frequent winners. By
Wednesday, lottery officials began raiding stores and seizing
lottery equipment associated with some of the top prize winners.
(Six of the 10 top winners in the lottery records were store clerks
and owners who sold lottery tickets.)
Meanwhile, Garibaldi
started eyeing data for winners of the Georgia Lottery. "The data
from the Georgia Lottery is not as good as from Florida, because
Georgia only lists winners for prizes of $5,000 or more," he says.
"But just casually looking at the Georgia data since 2003, I see
what may be suspicious numbers for repeat winners."