Quote from gmst:
Thanks Hurricane, I was truly taken aback by his attacking response. I find the problem of margin allocation and portfolio construction over multiple strategies and multiple symbols very challenging. Which trades to take, which to not take, changing correlations between different systems, how to rank different strategies etc. is a very challenging problem in my experience.
So, I was very curious to see how someone combines more than 100 strategies together in a portfolio and what it does to the smoothness of the portfolio equity curve. With 100+ strategies, there should never be a losing day.
Sometimes, written communication can be interpreted as it is it not intended. So, I even wrote in my post to Bill - that I am not attacking him, rather just asking him. Given his response, I guess I will have to agree with you - its a waste of my time to engage him anymore. He can massage his ego as much as he wants by claiming/believing to trade 132 working strategies.
My only experience with this problem is theoretical. The way I look at it - prioritize capital allocation according to performance. Rank the strategies according to performance (monthly, semi-annual, annual, 5 year....whatever) then give trading priority to higher performing strategies over lower, if you run into capital constraints from multiple signals. For instance, if you've got enough capital for 3 trades, and 7 signals were produced by strategies ranked #3, #49, #19, #18, #8, #23, #12 (according to their historical profitability), take signals from #3, #8, and #12. This maximizes capital accumulation and minimizes draw-down (theoretically). The second filter to all that is correlation. My take on correlation (instrument and strategy), is that uncorrelated strategies and pairs should take priority over correlated instruments and strategies. If you trade the ES, YM (which are highly correlated), and CL (which is less correlated), and three entries are triggered, it's better to take the ES and CL, then the ES and YM. The reason being, losses get compounded in correlated markets. Not sure why another poster said they don't. If you think about one strategy triggering a buy for GOOG, ES, APPL and ER2, and the market tanks, chances are, all four positions will take a hit. Stocks and the indices are tightly correlated. But if you were triggered long for the ES, 10 year, Bund, and the Euro and the market tanked, chances are, one or two of those trades would work out, as some of those instruments exhibit weak correlation. This minimizes your losses and protects your equity curve, which is number#1.
As far as nitty gritty stuff, trade size should be largest for your best strategies, and titrated down as strategies become less profitable. You want to maximize capital accumulation so weigh to your big guns first, 2nd best 2nd, 3rd best 3rd etc. Ranking can be done on a risk-adjusted basis with 1 contract, over a predefined look back. Or an average look-back. No need to curve-fit. It should be obvious, which are the best, which are second tier, third tier etc. I find it helpful to think in terms of Tiers.
I've got around 15 strategies that work and plan to add 2 or 3 variations to each "base" strategy. Pyramiding can be very profitable. Every system, if you think about it, is trend following, because it picks direction (long or short). If the strategy is profitable, why not add to it? So I've got another stack of ideas for pullback entries. These are abundant and not really something that requires a lot of thought. U can add on pullbacks, on candle breaks, volume breaks, formations, trendline breaks, oscillator crosses etc. Doesn't matter. If you strategies are solid, and pick direction well, you should be able to find logical, easy, plentiful places to ADD to that position. This compounds winners. Just some thoughts.