Monthly Archives: January 2012

Chapter 7…

Chapter 7 Recall from Chapter x that I believe that education is mostly what make individuals more polished dinner partners. The British government documents, as early as fifty years ago, present another aim for education than the one we have today: raising values, making good citizens, and “the intrinsic value of learning”, not economic growth. Likewise in ancient times, learning was for learning’s sake, to make someone a good person, worthy talking to; it was not for the vulgar aim to enhance the stock of gold in the city’s coffers. I will say it bluntly: entrepreneurs, particularly those in technical jobs are not necessarily the best people to have dinner with —the better at they are doing, the worst they tend to be with some exceptions, of course. I recall a heuristic I used in my previous profession when hiring people called in Fooled by Randomness “separate those who when they go to a museum look at the Cézanne on the wall from those who focus on the contents of the trash can”: the more interesting their conversation, the more cultured they were, the more we are trapped at thinking that they are effective at what they were doing something psychologists call the halo effect, the mistake in thinking that skills in, say, skiing translate into skills in managing a pottery workshop or a bank department. Clearly, it is unrigorous to judge the skills at doing from the skills at the talking the same conflation of event and exposure, or knowing with doing, or, more mathematically, mistaking the x for fx, good traders can be totally incomprehensible —they do not put much energy in turning their insights and internal coherence into elegant style. Entrepreneurs are selected to be just doers, not thinkers, and doers do, don’t talk, and it would be unfair, wrong, and downright insulting to measure them at the talk department. The same with artisans: the quality lies in their product, not their conversation —in fact they can easily have false beliefs that lead them to make better products, so what? But we should avoid the mental leap of going from the idea that making people interesting dinner partners to the notion that it creates economics growth, or that we should increase the stock of bureaucrats for that. Bureaucrats on the other hand, because of the lack of objective metric of success and absence of market forces, are selected on “hallo effects” of shallow looks and elegance —just say that a dinner with empty suits working for the World Bank would be more interesting than one with some of Fat Tony’s cousins.

via Chapter 7 Recall… | Facebook.

The Illusion of Thin-Tails Under Aggregation by Nassim Taleb, George Martin :: SSRN

The Illusion of Thin-Tails Under Aggregation

Nassim Nicholas Taleb

NYU-Poly

George A. Martin

affiliation not provided to SSRN

January, 18 2012

Abstract:

It is assumed that while portfolio theory fails with daily returns, that it would work with yearly returns, an standard argument recently repeated in Treynor (2011). This paper debunks the confusion that daily returns, when non-Gaussian but with finite variance can aggregate to thin tails. Alas, portfolio theory fails in both the short and the long run. The central limit theorem operates too slowly for economic data for us to use it and take portfolio theory with any degree of seriousness. The point is illustrated with a Monte Carlo simulation.

Number of Pages in PDF File: 4

Keywords: Risk, Portfolio Theory, Treynor, Markowitz

via The Illusion of Thin-Tails Under Aggregation by Nassim Taleb, George Martin :: SSRN.

The Stevens Center for Science Writings Presents: Antifragility: How to Protect Ourselves From -and Exploit –Unpredictability

That’s next Tuesday! In New Jersey. Hope they record it! HatTip to Dave Lull.

DeBaun Auditorium

6 PM

A talk by Nassim Taleb. Tuesday, January 24, 2012, 6-7:30. DeBaun Auditorium.

A professor of risk engineering at New York University, Taleb argued in his 2007 blockbuster The Black Swan that unpredictable events, “black swans,” have a much bigger impact on our lives than experts generally acknowledge. Credited by New York Times columnist David Brooks with having foreseen our current global recession, Taleb is visiting Stevens to discuss a work-in-progress, Antifragility, which proposes how we can reduce the threat of black swans–and reap their potential benefits–in the realms of technology, business, medicine and politics.

via The Stevens Center for Science Writings Presents: Antifragility: How to Protect Ourselves From -and Exploit –Unpredictability | Stevens Institute of Technology.