Monthly Archives: April 2010

Yes, You Are (Maybe) Overconfident | Messy Matters

218 of you took our calibration quiz, not counting the 10% of submissions that had to be thrown out for not being complete or giving ranges with the min greater than the max or other sanity check failures. (Here’s the raw data.)

The bad news is that you’re terrible at making 90% confidence intervals. For example, not a single person had all 10 of their intervals contain the true answer, which, if everyone were perfectly calibrated, should’ve happened by chance to 35% of you. Getting less than 6 good intervals should, statistically, not have happened to anyone. How many actually had 5 or fewer good intervals? 76% of you.

Here’s a histogram of the number of good intervals you got, out of 10:

Cerebral Mastication » Blog Archive » I don’t even know how wrong I am!

Shared by JohnH

Take the test here: http://messymatters.com/2010/02/28/calibration/ If you’ve been reading/listening, you’ll probably do very well ;-) [My score was 100%]

So simply put, providing confidence bands around a guess which is out of my area of experience is really hard and I’m not good at it. The biggest problem is knowing when I’m out of my domain. In both The Black Swan and Fooled by Randomness, Nassim Nicholas Taleb points out that the single strongest predictor for how bad someone is going to do at the confidence band game is if they hold a PhD. If anyone has a reference on the study he refers to, I’d love to see it. I’m resisting the temptation to throw stones at both actuaries and finance quants right here. And if I didn’t live in a glass house, I would!

India Today Conclave 2010

NNT spoke in India March 12, 2010.
(Click arrow to listen) NNT India

Update 03/11 YouTube videos coming in now.
Intro and Part 0 (I think, seems to have been mislabled as Part 5)

Part 1

Part 2

Part 3

Part 4

Banking system still weak: Taleb
Nivedita Mukherjee

 

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What is the power of the unknown? What can be the impact of invisibles? Well, the answer is in the realm of the unknown, according to Nassim Nicholas Taleb, author of Black Swan, philosopher and expert on risk engineering, who is now penning his thoughts on living in a world we do not understand.

The management guru has no accurate answer but, based on the current risk environment, a plethora of clues on the shape of things to come. At times, revolutions like the Internet are triggered off by intentions other than initially thought of, he said. For instance, he said it was former US president Ronald Reagan’s obsession with the destruction of the Soviet Union that sparked the Internet revolution.

Taleb believes that nation-states, which he describes as modern inventions, are very unstable, especially in the Western world. Already, as he pointed out, six million people are unemployed in the US and the centre of the world is moving away from the West.

Addressing the widespread intellectual ferment over the stability of the current financial system, Taleb hinted that governments would be better off relying on positive revenues like household savings. The banking system is still weak and Europe and the US are hit hard by deficits. In fact, according to Taleb, the US with its high GDP and high spending is far more fragile than India and Russia. The solution, Taleb said, lies in breaking the back of the debt system.

 

 

 

Taleb先生のおっしゃっているepistemic Infinity (@nntaleb) というのは日本語で何と言うんであろうか? 認識無限性? 認識済みの無限性?そもそもepistemicの意味がよう分からん。。。

Taleb先生のおっしゃっているepistemic Infinity (@nntaleb) というのは日本語で何と言うんであろうか? 認識無限性? 認識済みの無限性?そもそもepistemicの意味がよう分からん。。。