Use this to calculate the correlation of securities.
The correlation between two securities is defined
as the correlation
of their daily returns. This calculator calculates correlation
between 2015-01-01 and 2015-12-31.

If nothing seems to happen after you press the button, try
waiting a bit longer. The backend might need to download the
stock history from Yahoo, which takes a second or two per
symbol. The histories are cached, so the query should be a lot
faster the next time.