how to calculate correlation to s&P

when hedge funds publish there performance they mostly do it with some numbers like correlation to the S&P.

For example:

Statistics
Avg. annualized return 17,34%
Maximum drawdownt -20,84%
Standard Deviation (annual) 25,27%
Correlation S&P - 0.120
Correlation MSCI World - 0.116


My question is how to calculate the correlation to S&P.
There are many ways to calculate correlation but which one is used for hedgefunds or private equity curves.

thanks for help.
 
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