"You need the haystack to find the needle."
General Keith B. Alexander, Director of the US National Security Agency, on the the bulk collection of data.
"...we should listen to the data, but know when to tell the data to shut up!"
Peter Kennedy, "Oh No! I Got the Wrong Sign! What Should I Do?", Journal of Economic Education, 2005.
"Some economists seem to feel that data-driven theory is, somehow, unscientific. Of course, just the opposite is true."
Richard Thaler, "From Homo Economicus to Homo Sapiens", Journal of Economic Perspectives, 2000
"When Stepanov, the Russian, was told that Soviet national income statistics did not justify a quota of $1.2bn, he replied cheerfully that he would produce new statistics. He got his way."
On the Bretton Woods negotiations, from John Maynard Keynes 1883-1946 by Robert Skidelsky.
"True genius resides in the capacity for evaluation of uncertain, hazardous, and conflicting information."
"It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts."
Sherlock Holmes in A Scandal in Bohemia by Arthur Conan Doyle
"When statistics do not make sense I find it generally wiser to prefer sense to statistics."
John Maynard Keynes, letter to Erwin Rothbarth, January 1940
"It wasn't drudgery - far from it. Instead of reading Gone with the Wind, I was happy to immerse myself in 'Copper Ore Deposits in Chile'."
Alan Greenspan, from his autobiography Age of Turbulence
"History: statistics with small samples. Literature: statistics with falsified data"
"I have long had relatively little faith in judging statistical results by formal tests of significance. I believe that it is much more important to base conclusions on a wide range of evidence coming from different sources over a long period of time."
"These are facts. Afterward I'll try to connect them - if it's possible, for it's difficult to say what effect is produced by what cause. An angel's intervention would suffice to change everything, so it isn't surprising that one thing cannot be proved to be the cause of another thing. Even if one must always try, as I am doing."
William of Baskerville in The Name of the Rose by Umberto Eco
"Econometrics is much easier without the data"
Quoted in A Guide to Modern Econometrics by Marno Verbeek
"If applied econometrics were easy, theorists would do it."
From Mostly Harmless Econometrics by Angrist and Pischke
"The first lesson that you must learn is that, when I call for statistics about the rate of infant mortality, what I want is proof that fewer babies died when I was Prime Minister than when anyone else was Prime Minister. That is a political statistic."
"all nonmissing numbers < . < .a < .b < ... < .z"
"History provides contextual details, plausibility tests, external consistency checks, and a role for free will. Though not proof of causation, correlation is a smoking gun; and history can often supply sufficient circumstantial evidence to convict."
Morck and Yeung, "Economics, History and Causation", NBER WP 16678
"Correlation is not causation but it sure is a hint."
Edward Tufte, from The Cognitive Style of Powerpoint, quoted in Morck and Yeung
"The plural of anecdote is data"
"The plural of anecdote is not data"