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R: Calculating cumulative return of a portfolio

I've downloaded adjusted closing prices from Yahoo using the quantmod-package, and used that to create a portfolio consisting of 50% ...
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2 answers
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r: analyse series of historical positions as portfolio using 'standard' tools

I have a series of historical trading positions in the form Symbol OpenPrice OpenDate InvestmentInDollars CloseDate ReturnInDollars I need to evaluate the ...