Does it Ever Pay to Go Short?

I did some tinkering with the model to avoid the kind of false buy signal that resulted in the stop out last week. I applied Hodrick-Prescott filtering to one of my indicators. This eliminates these kind of false turning points but also eliminates a fairly subjective rule in my decision tree. So, overall that improves the model. This is one step further to a fully objective system that can be automated.

You need to be careful with HP filtering as it uses all the data in computing the smoothed estimate. So in back testing you have to run the filter repeatedly using just the data that was known up to that point.

The model is currently short. But I don't have a trade on. I am thinking to put a trade on when it switches back to long.

In a recent post, I showed that a hedged portfolio levered 1.5 times would track the market when the market does well and track the model when the model does well. Instead of thinking of this as trading plus investment we can examine it as a pure trading strategy. That suggests that it doesn't pay to go short. Just stay out of the market when the model is short and only take the long trades and lever up the returns. In 2018 so far, going short would add to returns though. But in 2017 going short detracted from returns. The model only won 45% of trades in 2017. The average win (1.57%) was almost double the average loss (-0.9%) though so, the expected value of a trade was still 0.2%. When we split trades into long (22) and short trades (24) instead the average long trade made 0.83% and the average short trade lost 0.39%. So, avoiding short trades would have doubled returns, returning 20% instead of 10% for the year. Of course, just going long for the whole year would have returned 32%. But we don't know that will happen ex ante. Levering the 19% by 1.5 times or so reproduces the long-only result.

The question now is whether you can win by going long only in a year like 2008. My intuition is that trading would result in a positive return for the year but that this would be insufficient to hedge the losses in an investment portfolio. It would moderate the downside though.

Testing that hypothesis will have to wait a little while.

But for the moment, volatility is low and so going long only might pay off.

Stopped Out...

My long position was stopped out on Wednesday. Now back to more or less zero profit on this account - still have a positive overall result from the trading experiment. Also, I realised that I still can't really psychologically handle trading overnight futures positions at the moment even at the smallest trade size. I am losing sleep because of it. So, I am going to stop trading for the moment. I need to get a lot of academic work done in the next two weeks before going on another overseas trip. At some point after I am back I will do some further research on trading models. My thinking is I could design a model that would only make trades when the odds were most in favor of winning. The current model trades all the time regardless. The ultimate long-run goal is automation of trading or taking it out of my hands in some other way. To achieve these goals I don't need to be trading continuously at the moment if I'm not making good money at it and  it's having negative effects instead.

I am also at the moment on a trip for a job interview. As I am learning more about the position it seems more challenging and to need leadership skills beyond what I have. I would be shocked at this point, though, if they offered me the position.

Losing Model Trade and Trading Badly

The downside didn't last long... Model switches back to long this morning. The short trade lost the model 0.4%. Due to bad timing - closing my long at pretty much the low point of the down move and going short, I gave back almost all the profits I'd made for the month so far. As a result, I have gone back to trading just one contract until I can get my act together properly.  So, back to Stage 2 of the process, after attempting Stage 3...

The NQ equity curve so far this year (starts at net profits from previous years):

The problem with tactical trades is that I then need to follow the market to see whether to open or close a tactical trade. But they're not necessary for getting a good long term return from the model. It probably would be better to diversify to trade more than one market first instead, as that will result in fewer losing days if the correlation between the markets is low. So, I did recently start to build a model for oil again, though I was a bit stuck in coming up with good decision rules so far.

Turkey Turns the Outlook Bearish

The down day on Friday in response the Turkish crisis switched the model to short going forward. Based on the 3 hour stochastics, there could be a bounce on Sunday evening (US time) continuing the bounce into the close on Friday. This could be a good opportunity to go short.