Quote from jwecme:
Even if there is no certainty of a profitable outcome, it does not automatically follow that the primary driver of that outcome is chance.
The greater the number of successful transactions viewed the lower chance is that it is âjust down to luckâ. If you take people like Jim Rogers or Warren buffet from the investing world you can be much more confident that their results are due to skill rather than luck as they have so many different decisions to make over a huge amount of time. It becomes harder and harder to sustain the argument that the primary driver of their success is luck.
Try picking up the book by Taleb "fooled by randomness it is an excellent read and he makes some great points on the role of chance in trading and investing. Successful high frequency over a long time span is actually the least likely to be based on luck as its primary driver.
Actually, in my interpretation of Taleb's book is that high frequency success can be countered be rare (black swan) loss that exceeds all cumulative wins. In other words, the long term expectancy of seemingly "high win" systems is negative or zero.
In addition, he gives particular credence to survivorship bias in decision making, whereas you might just be looking at lucky outliers when assessing your results: (ie are you a skilled investor or lucky idiot?)