# coefficient of variation

Also found in: Dictionary, Thesaurus, Financial, Acronyms, Encyclopedia, Wikipedia.

## co·ef·fi·cient of var·i·a·tion (CV),

the ratio of the standard deviation to the mean.

## coefficient of variation

Lab medicine The standard deviation divided by the mean, expressed as a percentage, used to evaluate and compare methodologies and instruments. See Mean, Standard deviation.## co·ef·fi·cient of var·i·a·tion

**(CV)**(kō'ĕ-fish'ĕnt var'ē-ā'shŭn)

A unitless number used to describe dispersion of data. It allows comparison of standard deviations of test results expressed in different units. It is calculated from the standard deviation (s) and mean (x). CV = 100s÷x.

## coefficient of variation

Analytical variability expressed as the standard deviation's percentage of the mean. This mode of expressing the analytical variability enables one to determine if the variability proportion changes with the actual value. It is typically a useful tool when there is a relatively large dynamic range for the quantity being measured. It is subject to misinterpretation if applied to numbers that have already been mathematically manipulated, such as logarithms.

See also: coefficient

Want to thank TFD for its existence? Tell a friend about us, add a link to this page, or visit the webmaster's page for free fun content.

Link to this page: