variance /var·i·ance/ (var´e-ans) a measure of the variation shown by a set of observations: the average of the squared deviations from the mean; it is the square of the standard deviation.
variance
var·i·ance (vâr  - ns, v r-)n. 1. The state or quality of being variant or variable; a variation. 2. The state or fact of differing or of being in conflict. 3. The square of the standard deviation. |
variance
[ver′ē·əns]
Etymology: L, variare
1 (in statistics) a numeric representation of the dispersion of data around the mean in a given sample. It is represented by the square of the standard deviation and is used principally in performing an analysis of variance.
2
Usage notes: nontechnical.
the general range of a group of findings. variance
one of the measures of the dispersion of data; the mean squared deviation of a set of values from the mean.
additive genetic variance
that portion of phenotypic variance which is due to the additive effect of genes (VA).
analysis of variance
a statistical method for comparing values, expressed in terms of means or variance, of one or more variables in several subgroups of a population. Called also anova.
non-additive genetic variance
that portion of phenotypic variance which is due to epistatic interactions (VI) and dominance deviations (VD).
non-genetic variance
that portion of phenotypic variance which is due to non-genetic effects such as environment (VE).
phenotypic variance
a measure of the extent to which individuals vary in their phenotype (VP). VP = VA + VD + VI + VE.
variance ratio distribution
see f distribution.
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