Standard Deviation (SD)

This is probably the most quoted measure of dispersion and it’s just the square root of the variance of a set of data. See Variance: introduction and, for the details, Variance: computation and bias (and perhaps Square root).

Try also #

Variance: introduction
Variance: computation and bias
Square root

Chapters #

Dispersion underpins pretty much all statistical methods so SD is implicit in Chapter 5.

Online resources #

My shiny app that gives you a confidence interval (CI) around an observed standard deviation

Dates #

First created 14.iii.24, replacing an earlier even more minimal entry!

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