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Trading Intuition

  
  Education
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I’ve heard from many traders that they often take decisions based on instincts. Actually, all non-quants use intuition in some form or another. If you are not using a program that takes all signals that your system produces, how do you decide between several equally good looking trading setups with similar risk to reward? Do you take them all or do you concentrate on only a few? The odds are that you are doing the latter and your ultimate choice for capital allocation is subconscious.

Even though we are defined by our decisions, we are often completely unaware of what’s happening inside our heads during the decision-making process.
Feelings are often an accurate shortcut, a concise expression of decades’ worth of experience.
The process of thinking requires feeling, for feelings are what let us understand all the information that we can’t directly comprehend. Reason without emotion is impotent. (more…)

Weatherall, The Physics of Wall Street-Book Review

  
  Education
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The Physics of WALL STREETJames Owen Weatherall’s The Physics of Wall Street: A Brief History of Predicting the Unpredictable (Houghton Mifflin Harcourt, 2013) is an engrossing book. Even though I was familiar with many of the stories the author recounts, at no point was I tempted to skip a page. Coming from me, that’s high praise indeed.

In the first chapter Weatherall takes the reader on a journey from sixteenth- and seventeenth-century attempts at a systematic theory of probability (Cardano, de Méré, Pascal, and Fermat) through Bachelier’s 1900 dissertation, A Theory of Speculation. Bachelier is credited with having come up with the random walk model/efficient market hypothesis. Like many quants, he was ahead of his time. “In a just world, Bachelier would be to finance what Newton is to physics. But Bachelier’s life was a shambles, in large part because academia couldn’t countenance so original a thinker.” (p. 27)

It wasn’t until Maury Osborne’s 1959 paper entitled “Brownian Motion in the Stock Market,” similar in both topic (predicting stock prices) and solution to Bachelier’s thesis, that people began to understand that physics could make a substantial contribution to finance. By then, as Osborne said, “Physicists essentially could do no wrong.” (p. 28) Scientists were in demand in industry, research facilities, and government. Pre-The Graduate, think nylon and the Manhattan Project.

Osborne found that stock prices don’t follow a normal distribution as Bachelier had suggested; rather, the rate of return on a stock (the “average percentage by which the price changes each instant”) is normally distributed. “Since price and rate of return are related by a logarithm, Osborne’s model implies that prices should be log-normally distributed.”  (more…)

The Alchemists of Wall Street

  
Analysis, Education
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Ever wonder what goes on behind the scenes? What kind of thinking and reasoning goes behind creating those sophisticated financial trading forumlas that create billions of dollars every year? Even more, do you wonder what kind of math wizard it takes to create these formulas?

Quants, or quantitative managers, are the math wizards and computer programmers in the engine room of our global financial system who designed the financial products that almost crashed Wall st.

The credit crunch has shown how the global financial system has become increasingly dependent on mathematical models trying to quantify human (economic) behaviour. Now the quants are at the heart of yet another technological revolution in finance: trading at the speed of light.

Below is a pretty interesting video that reveals the type of people and thinking that goes into creating these forumlas.



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