Z-Score vs. Standard Deviation: Key Differences in Volatility Measurement

Learn the differences between Z-Score and Standard Deviation. Discover how they are calculated and used to evaluate market ...
Yahoo Finance

Here's What Nerds Mean When They Say 'Standard Deviation'

Flickr via Google Images Standard deviation is a concept that's thrown around frequently in finance. So what is it? When working with a quantitative data set, one of the first things we want to know ...
Morningstar

Standard Deviation: In Defense of an Often-Dismissed Investing Metric

In response to my article, Is the Stock Market Too Concentrated?, which relied upon standard-deviation calculations to assess investment risk, a reader wrote: “My problem [with your argument] is ...
Investopedia

Understanding Residual Standard Deviation: Key Concepts, Formula & Examples

Will Kenton is an expert on the economy and investing laws and regulations. He previously held senior editorial roles at Investopedia and Kapitall Wire and holds a MA in Economics from The New School ...
BBC

Standard deviation The formulae

There are two formulae for standard deviation. \(s = \sqrt {\frac{{\sum {{{(X - \bar X)}^2}} }}{{n - 1}}}\) (where n is the sample size). The second formula is a re ...