Learn how to calculate Standard Deviationin Excel. The STDEV function can be used to estimate standard deviation based on sample in Excel.

Portfolio variance is calculated using the standard deviation of each security in the portfolio and the correlation between securities in the portfolio.

In a normal distribution, 68% of values are within 1 standard deviation of the mean, 95% of values are within 2 standard deviations of the mean and 99.7% of values are within 3 standard deviations ...