Sunday, July 01, 2018

Changing the Model Back and Researching the Model

I'm not happy with this model rule that I added on 27th April. It's not very systematic. So, I dropped it, while keeping rules added more recently. The stock market switches between two states - trending and cycling - and the model uses different indicators in each state. Deciding what state we are in is a little problematic. So, I am going to have another look at the rules for that and also possibly smoothing out very small moves, which are noise. The rule I just dropped was ad hoc - it switched to the indicator for the cycling state when we are in a trending state based on one period lagged positive performance.

Monday is a good test of the two algorithms - the simpler model is short and the model with the "ad hoc" rule is long. Let's see which wins.

I also thought of using the volatility indices, VIX and VXN, as indicators. The basic idea is that volatility is highest at bottoms in the market. But I couldn't see a way to do this. This graph shows why:

VXN (and VIX) rose throughout January while the stock market rose too. This was a warning sign that a correction was coming. But a model that shorts the market when VXN is expected to increase would have lost money all January. Also, my existing forecasting model is no good here...

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