isixsigma on MSN

Sigma in Statistical Analysis: What You Need to Know

The meaning of Sigma in statistical analysis is a function of whether you use the upper or lower case of the letter. The ...
Investopedia

What Is Six Sigma? Concept, Steps, Examples, and Certification

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 ...