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Would one be able to apply it to Fool services like Stock Advisor and The Million Dollar Port?

Hi blesto,

You could, if you knew the standard deviation of the monthly returns of the portfolio.

Finding that out is possible, but would require reconstructing the portfolio month by month from the transaction history and having access to historical price data for all open positions at the end of each month.

However, remember that Stock Advisor isn't a portfolio, as such, so calculating the Sharpe Ratio for it is of limited use.

Finally, remember that the Sharpe Ratio is predicated upon the assumption that standard deviation of return is a measure of risk, which comes from MPT. Few of us here agree with that assumption.

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