Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...

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.

Somewhere back in your middle school and high school math classes, you no doubt learned about the mean and standard deviation as fairly fundamental concepts in arithmetic and statistics. You also knew ...