Calculating variance using Python. Now that we’ve done the calculation by hand, we can see that completing it for a large set of values would be very tedious. Luckily, ...

Stock's historical variance measures its return stability over time. Higher variance indicates greater return unpredictability and risk. Calculate variance using Excel to simplify the process for ...

We'll calculate the historical monthly variance of the S&P 500 Total Return Index over a five-year period from August 2010 through July 2015 -- that's 60 observations (5 years x 12 months). Here's ...