By John Reese (@guruinvestor) — American philosopher and educator Nicholas Murray Butler once said, ” An expert is one who knows more and more about less and less until he knows absolutely everything about nothing.” His words, both wise and timeless, could apply to “expert” market forecasters. Butler (1862-1947) was president of both Columbia University and the Carnegie Endowment for International Peace, as well as a recipient of the Nobel Peace Prize–distinctions which would make… Read More
The unexpected Brexit vote and Donald Trump’s presidential election victory both occurred despite overwhelming predictions to the contrary, writes John Reese in a recent article for The Globe and Mail. The CEO of Validea illustrates how forecasting in the world of investing is “equally fraught with unpredictable outcomes despite seemingly reasonable expectations.” Reese supports his argument with the research findings of psychology professor Philip Tetlock, who conducted a study of the predictive success of both… Read More
The ability to predict the future sounds pretty enticing, but few (if any) are any good at it. In 2005, Wharton professor Philip Tetlock studied how ‘experts’ did at forecasting, and discovered that they were only slightly better at it than, say, a dart-throwing chimp. He spent the next ten years trying to figure out what separated most forecasters from those few that seemed to have real foresight. Tetlock shared his thoughts, the subject of… Read More
How often are supposedly “expert” forecasters’ predictions right? A lot less often than you might think, according to researcher Philip Tetlock. But in a recent interview on Barry Ritholtz’s Masters in Business podcast, Tetlock says you can take steps to make yourself a better forecaster. Tetlock, a professor at the University of Pennsylvania and author of multiple books on the science of prediction, has found that as a group, supposedly expert forecasters don’t have much… Read More
Writing in Adviser Perspectives, mathematician and economist Michael Edesess discusses Philip Tetlock’s work examining “superforecasters” with co-author Dan Gardner. Superforecasters, as Edesess explains, are the few volunteers in Tetlock’s forecasting study who “measure as significantly and consistently better than the others and much better than a dart-throwing chimpanzee.” Tetlock defines “foxes” and hedgehogs” among the large number of forecasters enrolled in his study. As the Greek poet Archilochus put it, “the fox knows many things,… Read More
In the aggregate, forecasters may be “roughly as accurate as a dart-throwing chimp,” but some forecasters are particularly and consistently far better than average. Credit Suisse reports that the book Superforecasting: The Art and Science of Prediction by Philip Tetlock and Dan Gardner provides important insights into how to improve forecasting skill, perhaps by as much as 60%. In other words, there are measurable differences between run-of-the-mill forecasters and “superforecasters,” and these differences can be a guide to improving forecasting… Read More
What lessons can investors take from 2014? Don’t listen to short-term economic and stock market forecasts, says The wall street journal’s Jason Zweig.
In a recent article for Canada’s Globe and Mail, Validea CEO John Reese says that when it comes to investing, boring is beautiful.
The pain of the 2008-09 financial crisis and market meltdown was deep and lasting, but there are signs that investors are finally moving on, say Jason Zweig, Joe Light, and Liam Pleven of The Wall Street Journal.
In the latest issue of Forbes magazine, Validea CEO John Reese examines why human beings tend to exercise bad judgment when making investment decisions, and how using quantitative investment strategies can help them overcome their poor predictive powers. Reese points to a study that Philip Tetlock detailed in his 2005 book, Expert Political Judgment: How Good Is It? How Can We Know? Tetlock’s seven-year study found that even the best human forecasters were accurate only… Read More