# Correlation Multiple Currencies

If i have a portfolio of stocks from different currencies and i want to generate a correlation matrix from the stocks, how is the correct procedure ?

Imagine a portfolio which the base currency is Brazilian Reais (BRL) and i have stocks quoted in BRL, EUR and USD. The correct way to generate a correlation matrix is :

a) Use the returns on the stocks in each currency and generate the matrix

b) Adjust all returns to the portfolio base currency and then generate the matrix

c) Other Solution

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Remember that returns are percentages: they are calculated as $$\frac{P_1 - P_0}{P_0}\times 100$$ [where $P_0$ is the price at the beginning of the period and $P_1$ is the price at the end] so it does not matter what currency you quote the price in: the "units" [of currency] fall off.