How much data is needed to validate a short-horizon trading strategy?
Suppose I have daily returns for a trading strategy against one month of data. Before starting trading on small quantities or buying further data, I would like to understand the worth of any such action. I am basically looking at the returns per day and the standard deviation between these returns.
Is there a standard theory that tells me about the minimum number of data points based on these factors i.e. daily returns, mean return and standard deviation? A minimum number of data points that gives me some sort of a confidence range to invest further for data.
Is there a standard theory that lets me infer some results into the future based on a standard approach?