# Deviation

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Related to sexual deviation: paraphilia, Sexual dysfunction, Sexual deviance

## deviation

[‚dēv·ē′ā·shən]
(engineering)
The difference between the actual value of a controlled variable and the desired value corresponding to the set point.
(evolution)
Evolutionary differentiation involving interpolation of new stages in the ancestral pattern of morphogenesis.
(optics)
The angle between the incident ray on an object or optical system and the emergent ray, following reflection, refraction, or diffraction. Also known as angle of deviation.
(petroleum engineering)
During a drilling operation, the inclination of the borehole from the vertical.
(statistics)
The difference between any given number in a set and the mean average of those numbers.

## Deviation

in artillery, an accidental phenomenon not allowed for in the laws of dispersion, by which shells (bullets) veer away from the mean trajectory expected under the given firing conditions. Causes of deviation may be the mechanical disruption of the movement of the shell in the bore (for example, separation of the shell from the rifling grooves) or in the air (for example, a defect in the stabilizer fins or other parts), as well as a chance sharp change in weather conditions during the flight of the shell.

## Deviation

in biology, a variety of phylembryogenesis in which a change in the development of an organ arises in the middle stages of its formation and results in a change in the structure of the organ in the adult organism, compared with the same organ in its ancestors. For example, in the middle stages of development the epidermal part of the scale buds of reptiles undergoes keratinization, not ossification (as in sharks). The term “deviation” was introduced by the German scientist F. Müller (1864).

## Deviation

the most common measure of dispersion, that is, deviation from the mean, in mathematical statistics and theory of probability. In the statistical sense, deviation

is the arithmetic mean of the squares of the deviations of the values Xi from their arithmetic mean

In the theory of probability the deviation (variance) of a random variable X is called the expected value E(X - mx)2 of the square of the deviation of X from its expected value mx =E(X). The deviation of a random variable X is denoted by D(X) or by σ2). The square root of the deviation (that is, if the deviation is σ2) is called standard deviation.

For a random variable X with continuous probability distribution, characterized by probability density p(x), deviation is calculated by the formula

where

The following theorem has great significance in the theory of probability: the deviation of the sum of independent terms is equal to the sum of their deviations. No less important is Chebyshev’s inequality, which allows us to evaluate the probability of large deviations of the random variable X from its expected value.

### REFERENCE

Gnedenko, B. V. Kurs teorii veroiatnostei, 5th ed. Moscow, 1969.

## deviation

i. The angular difference between a magnetic and a compass heading. It is a compass error caused by the compass magnet attempting to align with the aircraft's local magnetic field. The deviation error changes with the aircraft heading and the latitude. It is measured in degrees east (+) or west (−), depending on whether the north-seeking end of the compass needle lies to the east or west of magnetic north.
ii. The angle between the wind and the pressure gradient.
iii. In frequency modulation, the amount the carrier increases or decreases when modulated.
vi A departure from a current clearance, such as an off-course maneuver, to avoid bad weather or turbulence.
v A variation from set rules and regulations. Where specifically authorized in the regulation and requested by the pilot, ATC (air traffic control) may permit pilots to deviate from certain regulations.
vi. In flight, a sudden excursion from the normal flight path.
vii. The distance by which a weapon misses its target.
References in periodicals archive ?
Almost all are in the third world and are dependent on a combination of factors for their continuance, including tolerance of sexual deviations, relatively lax policing, strong criminal rings and an immeasurable supply of child workers.
If an expert in eating disorders were to review the literature on sexual deviation, the result would likely be incredulity.
Successful interventions include the use of community resources for meeting individual needs, family therapy, diversion and treatment for substance abuse or sexual deviation.
Brown and others, which provided a psychoanalytic explanation for sexual deviation, and Molina was shown to be working out his neurotic behavior with Valentin in the role of analyst malgre lui.
Abdul Moneim blames these woes on detrimental behavioural patterns among young people such as drug-taking, sexual deviations and radicalism.
They pointed out that in the State Department repeated drunkenness, recurrent nervous breakdowns, sexual deviations and other human frailties are considered security hazards, and persons showing any one or more of them are dismissed summarily," the embassy in Washington reported.
The nineteenth-century fascination with the Templars is charted, and modern debates about their supposed heresies and sexual deviations are read against French imperial expansion into the Middle East and Africa.
One of these hush-hush sexual deviations from the norm is group sex.
Sexual deviations as conditioned behavior: a hypothesis.
Ancient Rome, for instance, accelerated its fall with the sexual deviations and marital breakdowns of a disastrous collection of caesars.
Lastly, sexual deviations - does she want sex less often than usual?
The impersonal, or virtual, world especially suits some social and sexual deviations.

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