Fr.: erreur absolue
The difference between the measured value of a quantity x0 and its (true) actual value x, given by Δx = x0 - x. See also: → relative error.
irang-e varak, xatâ-ye ~
Fr.: erreur de biais
A measurement error that remains constant in magnitude for all observations; for example an incorrectly set zero adjustment.
Fr.: erreur d'étalonnage
A systematic error in the constant values to be applied to a measuring instrument.
irang-e peyšâri, ~ âbšâri
Fr.: erreur en cascade
An error that amplifies as the process of calculation goes on.
irang (#), xatâ (#)
1) A deviation from accuracy or correctness; a mistake.
From O.Fr. erreur, from L. errorem (nom. error) "a wandering, straying, mistake," from errare "to wander."
Irang, from Mid.Pers. êrang "error, mistake;" xatâ, from Ar.
band-e irang, ~ xatâ
Fr.: barre d'erreur
On a graph displaying the results of a measurement, the dash used to indicate the confidence range of the value attributed to a quantity.
→ error; bar, from O.Fr. barre, from V.L. *barra "bar, barrier," or perhaps from Gaulish *barro "summit."
Band "that which closes, shuts, blocks," from bastan, band- "to shut, bind," from Mid.Pers. bastan/vastan "to bind, shut," Av./O.Pers. band- "to bind, fetter," banda- "band, tie" (cf. Skt. bandh- "to bind, tie, fasten," PIE *bhendh- "to bind;" Ger. binden; E. bind); → error.
irang-e saz-kard, ~ saz
Fr.: erreur d'ajustement
The discrepancy between the mathematical curve and data points. → fit.
irang-e sâzâl, xatâ-ye ~
Fr.: erreur instrumentale
The correctable part of the inaccuracy of a measuring instrument.
Fr.: erreur observationnelle
The difference between a measured value of quantity and its true value.
probable error (PE)
Fr.: erreur probable
A deviation from the population mean μ such that 50% of the observations may be expected to lie between μ - PE and μ + PE. For the normal distribution, the probable error is 0.6745 times the standard deviation.
Fr.: erreur fortuite
The fluctuating part of the overall error that varies from measurement to measurement. Normally, the random error is defined as the deviation of the total error from its mean value; opposite of → systematic error.
Fr.: erreur relative
The → absolute error divided by the true value x, that is: Δx/x. The result may be expressed as a percentile and is useful when we want to determine the error relative to the value of the exact quantity.
irang-e riše-ye câruši-ye miyângin, ~ ~ dovom-e ~
The square root of the second moment corresponding to the frequency function of a random variable.
Fr.: erreur d'échantillonnage
That part of the difference between a population value and an estimate thereof, derived from a random sample, which is due to the fact that only a sample of values is observed; as distinct from errors due to imperfect selection, bias in response or estimation, errors of observation and recording, etc.
Fr.: erreur type
Same as → standard deviation.
Fr.: erreur systématique
The error that is constant in a series of repetitions of the same experiment or observation. Usually, systematic error is defined as the expected value of the overall error. opposite of → random error.
Type I error
irang-e gune-ye I
Fr.: erreur de type I
Type II error
irang-e gune-ye II
Fr.: erreur de type II