Hi all, I have the following problems that I need your diagnosis. I have three daily systems that are running real. From paper trading, I know the Sharpe ratios are A>B>C. However after real-trading for a few months, the results are mixed. The problems are: 1. because these are long/short systems, I cannot compare them. If I compute the Sharpe ratio in the past few months, the number of data-sample is just too small and the real-trading history too short. If I want to compare which made the most money during the past few months, I don't have a common basis to compare - because their notional size (gross and net) are very different. The only thing I know is that on the inception day, the three systems had about 0.16 million, 0.28 million and 0.21 million in gross notional amount. And their cumulative PnLs are different too. Is there a way to really compare the systems other than the long-term historical Sharpe ratios? I ask this because I want to upgrade to new systems, but there is no way to judge if the new system will make more money or be better. The only number that I can use as a guideline is the long term historical Sharpe ratio. I am paper trading a few systems for a while, but am still unable to compare the systems. 2. How do I tell if a system is good or bad in real-trading? I only know that the systems are making mild profits, but the results are kindof disappointing... Please share with me your experiences... thanks so much!