In order to conclude that a particular trading strategy truly leads to excess returns on individual stocks or if the results are just due to noise, you would need about how many years
Worth of daily return data?

Question

Quizplus · Accepted Answer

In order to conclude with a high level of confidence that a particular trading strategy truly leads to excess returns on individual stocks, historical daily return data spanning at least 150 years is necessary to account for fluctuations that may be due to noise. This is due to the fact that market trends and fluctuations occur in cycles that exceed single-lifetime long-term investments. In order to determine if a trading strategy truly leads to excess returns on individual stocks, it is necessary to have a large sample size of daily return data over a long period of time. A period of at least 150 years is recommended to ensure that the results are not just due to noise or short-term fluctuations in the market.

In Order to Conclude That a Particular Trading Strategy Truly