Recently, I have been mulling over the consistent criticism I’ve heard of quant traders. It’s a big topic and one which I intend to continue exploring in these pages, but I decided I had to start at some point, so here goes…
For starters, let’s define the quant trader. The traditional view is someone who uses a formula to analyze price and time data (e.g. charts, technical indicators, volume, etc.) to make investment decisions. I’d like to work on changing that view. In my mind a quant trader is someone who uses strict rules to trade. Taking it one step further, a quant trader is someone who can define before a trade is ever made, what the criteria will be for making the trade. The quant trader is a process-oriented investors/trader (used interchangeably for the sake of our conversation here.) Here’s an example, hit on 16 or lower, stay on 17 or higher. It’s a rule for the casino dealers. They know that they might win or lose on any given hand, but that the process for deciding whether to hit or stay is built on a solid foundation. Similarly in investing, if you base your investment decision on logical, tested factors, you cannot control the outcome of any given trade, but at least you can be confident in your expected return in the long term.
A guy runs through a dynamite factory with a lit match and comes out the other side alive and screams, “You see!” Just because he came out the other side alive, doesn’t mean he’s not an idiot. Success, then, cannot be the deciding factor. The deciding factor must be the decision making process BEFORE he ran through the factory. In order to determine which manager to choose, or whether an investment is a good one, the quant trader goes through the process of defining the criteria for success BEFORE a trade is made, not after.
Recently, a friend who helps manage a long/short equity fund disputed my arguments. He believes that to generate alpha, the truly great investors are able to make judgments better than others. Alpha is generated by being able to get a “feel” for a management team’s prospects. Alpha is generated by being able to have more exposure to winners and minimizing losers through portfolio weightings. That might be true, I countered, but would you be able to know which one of those managers was great BEFORE they were great? I would rather not look for those managers. I countered that to judge a management team is important, but you have to determine the criteria beforehand and be consistent for all management teams. Then you can compare them. Then you can rank them. Then you can have a good process.
My preference is to look at that process. Do you have a repeatable process? Does your process have predictive value? I don’t care as much about historical performance, because chances are pretty high that there will be some speculator out there who did better. The great investors to me are the ones who have a definable process. Benjamin Graham had a three factor value model. Completely quantitative. Completely fundamental. Repeatable. High predictive value. Simple, just not easy to implement.
So when I hear people, investors, or some pension plan consultant criticizing quants, I have to question what they prefer. Maybe they should concentrate on their own process, and think of ways to measure themselves to reflect it. Was I consistent in my approach? Does my approach have predictive value to leading to good investment choices? Can I define my criteria before a trade? If so, can I measure that criteria and make good comparisons with all other investment choices? If they do that, if the incentive structure supports a process orientation, rather than a random results orientation, we would probably all be better off.