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F distribution
F distribution (plural F distributions)


noun 
Definition:
 
probability measure: a statistical measure of the spread or scattering of members of two observed random samples as a test of whether the samples have the same variability. The F distribution is obtained by taking the ratio of the chi-square distributions of the samples divided by the number of their degrees of freedom.
[Mid-20th century. After Sir Ronald Fisher (d. 1962), British statistician]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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