...The problem of course is what you do with that 30% of the time you are wrong. A stop loss, obviously. But where does the stop/profit target go so that your risk-reward over a long distribution of trades is still positive?
Hard to determine this on the fly in real-time. So then you add filters…”yesterday the DAX was down by 1.5%, so I know there is a 72% chance the DAX’s low today is below yesterday’s low. But the market is opening with a bullish overnight gap….should I still take this long trade?...oh but wait, it’s the third week in April, and this is historically a bullish period for the DAX, so yes, I will take this long trade.” And then you take a loss….hmm, which do I rely on? My seasonal guide, price performance guide, or price bars guide?
These are the types of mental gymnastics I would go through while trying to refine an edge that I could execute on. The losses along the way just clouded the decision-making further…this is the sort of thing that pushed me towards fully systematic trading approaches. To get myself out of the way...