# Deviation

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## 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 ?
Varun Gandhi's cousin Priyanka Gandhi on Saturday in a meeting with Congress workers in Amethi district had said that Varun Gandhi had deviated from the correct path and hence people should vote with discretion.
A spokeswoman for the Labour leader said: "Ed Miliband had an operation this morning to correct a deviated septum in order to help with his sleep apnoea.
This indicates just how far the official church's teaching has deviated from the primacy of the rule of love found in all major religions.
Turkish civil aviation officials said on 3 December that the Atlasjet Airlines MD 83 that crashed last week deviated sharply from its course before the crash.
In how many ways have America's corporate leaders deviated from the right path in recent years?
has developed a suture-suspension technique to correct a proximally deviated dorsal septum.
The court noted that prior cases deviated only if the tables' underlying assumptions were incorrect.
So far, none of scientists' many measurements of gamma, using telescope observations and space probes, has deviated from Einstein's predictions.
In a Class "A & B" office market comprising over 900 buildings totaling over 90 million SF, both Fairfield and Westchester counties have maintained a combined vacancy rate over the last 12-month peiod (including sublease space) that has not deviated by more than approximately 1 percent, while the total available space between the two counties hovers at approximately 12 million SF.
For some geometric shapes and non-least-squares fit objectives, the algorithms used in the commercial software deviated from the NIST results significantly.
It is because Muslims have deviated from the fundamentals of Islam and have abused the teachings in order to justify their personal greed and ambitions.
Automatically, the percentage of overnights is computed, qualification for a deviated child support calculation is determined, and the program, without further input, performs all of the complex calculations.

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