standard deviation (redirected from Quadratic deviation)

deviation /de·vi·a·tion/ (de″ve-a´shun)

1. variation from the regular standard or course.

2. strabismus.

3. the difference between a sample value and the mean.

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complement deviation  inhibition of complement fixation or complement-mediated immune hemolysis in the presence of excess antibody.

conjugate deviation  deflection of the eyes in the same direction at the same time.

immune deviation  modification of the immune response to an antigen by previous inoculation of the same antigen.

radial deviation 

1. a hand deformity sometimes seen in rheumatoid arthritis, in which the fingers are displaced to the radial side.

2. splinting of arthritic hands into this position to correct ulnar deviation.

sexual deviation  sexual behavior or fantasy outside that which is morally, biologically, or legally sanctioned, often specifically one of the paraphilias.

standard deviation  (SD) a measure of the amount by which each value deviates from the mean; equal to the square root of the variance; symbol σ.

ulnar deviation  a hand deformity of chronic rheumatoid arthritis and lupus erythematosus in which swelling of the metacarpophalangeal joints causes displacement of the fingers to the ulnar side.

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standard deviation

n. Symbol

A statistic used as a measure of the dispersion or variation in a distribution, equal to the square root of the arithmetic mean of the squares of the deviations from the arithmetic mean.

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Standard deviation

A measure of the distribution of scores around the average (mean). In a normal distribution, two standard deviations above and below the mean includes about 95% of all samples.

Mentioned in: Stanford-Binet Intelligence Scales, Wechsler Intelligence Test

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standard deviation (SD),

(in statistics) a mathematic statement of the dispersion of a set of values or scores from the mean.

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standard,

n that which is established by authority, custom, or general acceptance as a model; criterion.

standard deviation (SD),

n a computed measure of the dispersion or variability of a distribution of scores around a given point or line. It measures the way an individual score deviates from the most representative score (mean). A small SD indicates little individual deviation or a homogeneous group, and a large SD indicates much individual deviation or a heterogeneous group.

standard error,

n a measure or estimate of the sampling errors affecting a statistic; a measure of the amount the statistic may be expected to differ by chance from the true value of the statistic.

standard error of estimate,

n the standard deviation of the differences between the actual values of the dependent variables (results) and the predicted values. This statistic is associated with regression analysis.

standard error of the mean,

n an estimate of the amount that an obtained mean may be expected to differ by chance from the true mean.

standard of care,

n a written statement describing the rules, actions, and conditions that direct patient care. Standards of care guide practice and may be used to evaluate performance. Also referred to during the practice of dentistry when discussing quality of care.

standard operating procedure (SOP),

n a method of functioning that has been established over time in order to execute a specific task or react to a specific set of circumstances.

standard orders,

n.pl the rules, policies, procedures, regulations, and orders for the conduct of patient care in various stipulated clinical situations.

standard precautions,

n a set of procedures designed by the Centers for Disease Control and Prevention (CDC) to prevent the spread of known and unknown sources of infections. It formerly was called
universal precautions and applies to blood; body fluids, excretions, and secretions of the skin; and oral mucosa.

standard score,

n a derived score indicating the degree of deviation of an individual score from the mean using the standard deviation as the unit of measure.

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deviation

variation from the regular standard or course.

1. In ophthalmology, a tendency for the visual axes of the eye to fall out of alignment owing to muscular imbalance.

2. in statistics the difference between the predicted value of a variable and the actual value.

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standard deviation

a measure of statistical dispersion. See standard deviation.

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standard

something established as a measure or model to which other similar things should conform.

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bacteriological standard of meat

the standard bacterial count of meat beyond which local legislation forbids the sale or use of meat. The international standard is for <107/g of meat and that Salmonella spp. should not be present in more than one of five 25 g samples, all held at 95°F (35°C) or 68°F (20°C) for chilled meat.

standard bicarbonate

in blood gas analysis this is the plasma level of bicarbonate, under specified conditions, which eliminates the influence of respiration on the values obtained.

standard deviation

a measure of the dispersal of a random variable; the square root of the average squared deviation from the mean. For data that have a normal distribution about 68% of the data points fall within one standard deviation from the mean and 95% fall within two standard deviations. Symbol is σ.

standard error

the standard deviation of an estimate.

standard error of mean

the sampling variability of the mean.

standard international (SI) units

see Table 3.

standard population

a population not yet divided into classes; the population against which each of its constituent classes can be compared.

standard Salmonella pullorum strains

strains that contain only small amounts of 12₂ antigen.

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standard deviation

Square root of the variance Statistics The most widely used measure of the dispersion of a set of values about a mean, which is equal to the positive square root of the variance, where a graphic representation of the data points is described by a curve with Gaussian distribution–GD–ie, bell-shaped. See Gaussian curve.