Standard deviation: Difference between revisions
From ACT Wiki
Jump to navigationJump to search
imported>Doug Williamson (Differentiate from Mean Deviation.) |
imported>Doug Williamson (Add link.) |
||
| Line 16: | Line 16: | ||
== See also == | == See also == | ||
* [[Beta]] | |||
* [[Coefficient of variation]] | * [[Coefficient of variation]] | ||
* [[Correlation]] | * [[Correlation]] | ||
Latest revision as of 15:22, 20 August 2022
Statistics - measures of spread.
(SD).
Standard deviation measures the spread of data around their mean.
The standard deviation is the square root of the variance.
Standard deviation is used widely as a measure of risk, because it is relatively easy to calculate, and to compare and combine with the standard deviations of other variables.
Its order of magnitude is the difference, ignoring the sign, between the mean and a randomly chosen item in the population.
Standard deviation is a similar concept to mean deviation, but it is calculated on a more refined basis.
