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Rapid shifts are the hallmark of climate change, epileptic seizures, financial crises, and fishery collapses…

From SEED:

Nonlinear systems, however, are not so well behaved. They can appear stationary for a long while, then without anything changing, they exhibit jumps in variability—so-called “heteroscedasticity.” For example, if one looks at the range of economic variables over the past decade (daily market movements, GDP changes, etc.), one might guess that variability and the universe of possibilities are very modest. This was the modus operandi of normal risk management. As a consequence, the likelihood of some of the large moves we saw in 2008, which happened over so many consecutive days, should have been less than once in the age of the universe.

Our problem is that the scientific desire to simplify has taken over, something that Einstein warned against when he paraphrased Occam: “Everything should be made as simple as possible, but not simpler.” Thinking of natural and economic systems as essentially stable and decomposable into parts is a good initial hypothesis, current observations and measurements do not support that hypothesis—hence our continual surprise. Just as we like the idea of constancy, we are stubborn to change. The 19th century American humorist Josh Billings, perhaps, put it best: “It ain’t what we don’t know that gives us trouble, it’s what we know that just ain’t so.”

Wisdom.

Right Action and Beliefs: Foundational for Trading Success

The rules and the math are a mission critical part of trend following success, but your mind’s organization will always be the determining factor for long and worthwhile gains. Marcus Aurelius wrote:

Two kinds of readiness are constantly needed: (i) to do only what the logos of authority and law directs, with the good of human beings in mind; (ii) to reconsider your position, when someone can set you straight or convert you to his. But your conversion should always rest on a conviction that it’s right, or benefits others–nothing else. Not because it’s more appealing or more popular.

This is why so many convert to trend following–it can be believed and it is right.

Too Much Data Is Toxic–Trend Followers Get This Terribly Important Principle Deep in Their Gut

An excerpt (source):

In business and economic decision-making, data causes severe side effects —data is now plentiful thanks to connectivity; and the share of spuriousness in the data increases as one gets more immersed into it. A not well discussed property of data: it is toxic in large quantities —even in moderate quantities.

More:

The more frequently you look at data, the more noise you are disproportionally likely to get (rather than the valuable part called the signal); hence the higher the noise to signal ratio. And there is a confusion, that is not psychological at all, but inherent in the data itself. Say you look at information on a yearly basis, for stock prices or the fertilizer sales of your father-in-law’s factory, or inflation numbers in Vladivostock. Assume further that for what you are observing, at the yearly frequency the ratio of signal to noise is about one to one (say half noise, half signal) —it means that about half of changes are real improvements or degradations, the other half comes from randomness. This ratio is what you get from yearly observations. But if you look at the very same data on a daily basis, the composition would change to 95% noise, 5% signal. And if you observe data on an hourly basis, as people immersed in the news and markets price variations do, the split becomes 99.5% noise to .5% signal. That is two hundred times more noise than signal —which is why anyone who listens to news (except when very, very significant events take place) is one step below sucker.

More:

To conclude, the best way to mitigate interventionism is to ration the supply of information, as naturalistically as possible. This is hard to accept in the age of the internet. It has been very hard for me to explain that the more data you get, the less you know what’s going on, and the more iatrogenics you will cause.

Trend followers tackle the issues raised by Taleb by making their trading decisions off the market price. Boom–one piece of data for all of your trading decisions–price.

Article Source: Ritholtz.com.

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