Fear and Greed is Shifting and Models Don’t Avoid the Feelings

Investors are driven by fear and greed. That same fear and greed drives market prices. It’s Economics 101 “Supply and Demand”. Greed drives demand, fear drives selling pressure. In fact, investors are driven by the fear of losing more money when their account is falling and fear missing out if they have cash when markets go up. Most investors tend to experience a stronger feeling from losing money than they do missing out. Some of the most emotional investors oscillate between the fear of missing out and the fear of losing money. These investors have to modify their behavior to avoid making mistakes. Quantitive rules-based systematic models don’t remove the emotion.

Amateur portfolio managers who lack experience sometimes claim things like: “our quantitive rules-based systematic models removes the emotion”. That couldn’t be further from the truth. Those who believe that will eventually find themselves experiencing feelings from their signals they’ve never felt before. I believe it’s a sign of high expectations and those expectations often lead to even stronger reactions. It seems it’s the portfolio managers with very little actual performance beyond a backtest that make these statements. They must believe a backtested model will act to medicate their feelings, but it doesn’t actually work that way. I believe these are the very people who over optimize a backtest to make it perfectly fit historical data. We call it “curve-fitting” or “over-fitting”, but it’s always “data mining”. When we backtest systems to see how they would have acted in the past, it’s always mining the data retroactively with perfect hindsight. I’ve never had anyone show me a bad backtest. If someone backtests entry and exit signals intended to be sold as a managed portfolio you can probably see how they may be motivated to show the one that is most optimized to past data. But, what if the future is very different? When it doesn’t work out so perfectly, I think they’ll experience the very feelings they wish to avoid. I thought I would point this out, since many global markets have been swinging up and down. I’m guessing some may be feeling their feelings.

The CNN Fear & Greed Index shows investor fear and greed shifted to Extreme Fear a month ago as the popular U.S. stock indexes dropped about -12% or more. Many sectors and other markets were worse. Since then, as prices have been trending back up, Greed is now the driver again. I believe fear and greed both drives market prices but also follows price trends. As prices move lower and lower, investors who are losing money get more and more afraid of losing more. As prices move higher and higher, investors get more and more greedy. If they have reduced exposure to avoid loss, they may fear missing out.

CNN Fear and Greed IndexSource: http://money.cnn.com/data/fear-and-greed/

This is the challenge in bear markets. In a bear market, market prices swing up and down along the way. It’s these swings that lead to mistakes. Below is a chart of how the Fear and Greed Index oscillates to high and low points over time. Investors who experience these extremes in emotion have the most trouble and need to modify their behavior so they feel the right feeling at the right time. Or, hire a manager with a real track record who can do it for them and go do something more enjoyable.

Fear and Greed Over time investor sentiment

Source: http://money.cnn.com/data/fear-and-greed/

Back Testing

The glossary on Stockcharts.com explains it well:

“Back Testing: A strategy that is optimized on historical data, then applied to current data to see if the results are similar. Rarely done properly and usually resorts to a form of curve fitting.”

Yep, that is what it is…

Back testing can be useful to quantify a complete system, but back testing has many weaknesses and is very rarely applied and used correctly. To be sure, just look at the actual performance post back test of those who advertise back tested performance.