A few things you might want to consider:
The kelly criterion is a good measure of how your system will accumulate weath over time. There are websites that can graph it out for you. What is also is interesting about the kelley is to plug your longest losing streak in and see how quickly you would lose wealth.
I feel like systems should be created by normaliztion of loss. So when entering any trade your max loss is X. So when reporting results one would say that per trade I make X or 2X or .5X.
Also you have to consider the longest losing streak of days or trades or whatever time frame you want. I usally assume that longest losing streak can be triple of what I have seen so far. What kind of damage would that do?
Removal of the positive outliers and keeping the negative outliers and then seeing your system results is also a good test of its durabilty.
Finally, in regards to slippage, it is one of the biggest unknown variables in a daytrading system. Some people use a hard dollar number, some people use a combo of price and avg vol per stock. But nothing beats good ole real time forward testing. If slippage turns your results negative, then you never had a good system to begin with.
RW
The kelly criterion is a good measure of how your system will accumulate weath over time. There are websites that can graph it out for you. What is also is interesting about the kelley is to plug your longest losing streak in and see how quickly you would lose wealth.
I feel like systems should be created by normaliztion of loss. So when entering any trade your max loss is X. So when reporting results one would say that per trade I make X or 2X or .5X.
Also you have to consider the longest losing streak of days or trades or whatever time frame you want. I usally assume that longest losing streak can be triple of what I have seen so far. What kind of damage would that do?
Removal of the positive outliers and keeping the negative outliers and then seeing your system results is also a good test of its durabilty.
Finally, in regards to slippage, it is one of the biggest unknown variables in a daytrading system. Some people use a hard dollar number, some people use a combo of price and avg vol per stock. But nothing beats good ole real time forward testing. If slippage turns your results negative, then you never had a good system to begin with.
RW
