Steven Nickolas is a writer and has 10+ years of experience working as a consultant to retail and institutional investors. Portfolio variance is a measure of the dispersion of returns of a portfolio.

When reviewing cash flow data for your small business, knowing the standard deviation can help you determine if the numbers are out of whack. Calculating standard deviation manually can be ...

In the first part the property of "minimum error", proved by Fisher for the estimates based on the powers of the deviations from the mean, is extended to the estimates based on the powers of the ...