variance

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Related to variances: standard deviation

deviation

 [de″ve-a´shun]
1. a turning away from the regular standard or course.
2. in ophthalmology, strabismus.
3. in statistics, the difference between a sample value and the mean.
axis deviation an axis shift in the frontal plane, as seen on an electrocardiogram. There are three types: Left, from −30° to −90°; Right, from +90° to +180°; and Undetermined, which may be either extreme left or extreme right, from −90° to +180°.
conjugate deviation dysfunction of the ocular muscles causing the two eyes to diverge to the same side when at rest.
sexual deviation sexual behavior or fantasy outside that which is morally, biologically, or legally sanctioned, often specifically one of the paraphilias.
standard deviation (SD) the dispersion of a random variable; a measure of the amount by which each value deviates from the mean. It is equal to the square root of the variance. For data that have a normal distribution, about 68 per cent of the data points fall within (plus or minus) one standard deviation from the mean and about 95 per cent fall within (plus or minus) two standard deviations. Symbol σ.
ulnar deviation a hand deformity, seen in chronic rheumatoid arthritis and lupus erythematosus, in which swelling of the metacarpophalangeal joints causes the fingers to become displaced to the ulnar side. Called also ulnar drift. See illustration.
 Ulnar deviation (ulnar drift) of the metacarpophalangeal joint, a characteristic sign of rheumatoid arthritis. From Pedretti and Early, 2001.

var·i·ance

(var'ē-ăns),
1. The state of being variable, different, divergent, or deviate; a degree of deviation.
2. A measure of the variation shown by a set of observations, defined as the sum of squares of deviations from the mean, divided by the number of degrees of freedom in the set of observations.

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

[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

A measure of the variability in a sample or population, which is calculated as the mean squared deviation (MSD) of the individual values from their common mean. In calculating the MSD, the divisor n is commonly used for a population variance and the divisor n-1 for a sample variance.

var·i·ance

(var'ē-ăns)
1. The state of being variable, different, divergent, or deviate; a degree of deviation.
2. A measure of the variation shown by a set of observations, defined as the sum of squares of deviations from the mean, divided by the number of degrees of freedom in the set of observations.

variance (s2)

(in statistics) the variation around the ARITHMETIC MEAN. It is calculated as the average squared deviation of all observations from their mean value. The square root of variance is the STANDARD DEVIATION

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
References in periodicals archive ?
While students are told in class that many variances are actually zero in the workplace, there seems to always be a variance in the textbook (to show what does happen when a variance does occur).
THE RESULT ALLOWS 18 DAYS VARIANCE FROM THE SCHEDULED
Manufacturing companies typically report two measures related to capacity costs: the fixed overhead volume variance and fixed overhead spending variance.
We analyze the persistent-versus-transitory nature of rising inequality by decomposing income into persistent and transitory parts and examining how much each of these parts contributed to the increase in the cross-sectional variance of income (our measure of income inequality; see footnote 1) over our sample period.
Key Executives Outline the Necessity of an Expert Managed Care Compliance Team in Analyzing Contract Variance
On the basis of variance component model estimates, Dickens finds that both the transitory and permanent variances increased over the period for most birth cohorts.
This eliminates variances caused because we sold more or less than we anticipated and gives us a more accurate picture of what should have happened during the period.
Tallerman, saying he was uncomfortable binding the hands of the board in the site plan review process by setting something in stone in the variance conditions.
The proportion of patients with at least one unintended medication variance was calculated, as well as the mean number of unintended variances per patient.
Without knowing how much work was scheduled to be completed, we cannot calculate schedule variance (SV).
The BSA, a quasi-judicial entity, may grant variances from use and bulk provisions to ensure that an eminent domain taking does not occur in violation of the Constitution's fifth amendment.