# 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.

Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

## 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.

Farlex Partner Medical Dictionary © Farlex 2012

## 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.Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

## 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.

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

## 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 DEVIATIONCollins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

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