return or log return

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Mate 2u
Mate 2u 2012-1-24
Hi there, I downloaded 2 sets of financial data from yahoo finance earlier.
I am calculating the daily returns by using the opening price and closing price (CP-OP)/CP........Now when I log this I get negative values even though I have positive returns on some days. Additionally it does not allow me to compute correlation and coefficient.
Can anybody tell me if I am doing something wrong or should I not take the log of the return?
Even when I log CP/OP it still gives bad values.

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