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Ковариация
| Глоссарий по эконометрике (англо-русский) |
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Covariance, английский
- Ковариантность; ковариация
- The covariance between two attributes or events is a statistical measure of their association. for two continuous attributes, the covariance is computed as s(x-?x)(y-?y)/(n-1), the average cross-product of the deviations of the individual values from their average or expectation. see also: correlation, expectation.
- A statistical measure of the tendency of two variables to change in conjunction with each other. it is equal to the product of their standard deviations and correlation coefficients.
- In programming languages, the ability to use a more derived type than that originally specified. covariance in generic interfaces and delegates allows for implicit conversion of generic type parameters. covariance is also supported for non-generic delegates for matching method signatures with delegate types. cover (n)
- A statistical measure of the degree to which random variables move together. a positive covariance implies that one variable is above (below) its mean value when the other variable is above (below) its mean value.
Covariation, английский
Ковариация
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Coherence, английский
- Соответствие; согласованность
- Lasers and leds emit coherent light waves that are in phase with one another. describes properties of the correlation between a single wave, or between several waves or wave packets. when interfering, two waves can add together to create a wave of greater amplitude than either one (constructive interference) or subtract from one another to create a wave of lesser amplitude than either one (destructive interference)
- A property of electromagnetic waves which are in phase in both time and space. coherent light has monochromaticity and low beam divergence, and can be concentrated to high power densities. coherence is needed for interference processes like holography.
- The alignment between light wave wavelength and the position of that wave in its oscillation cycle. when the crests and troughs of several light waves are in alignment, they are coherent. collimated light
- A fixed phase relationship between the electric field values at different locations or at different times
- И coherency
Covariance, английский
- Ковариантность; ковариация
- The covariance between two attributes or events is a statistical measure of their association. for two continuous attributes, the covariance is computed as s(x-?x)(y-?y)/(n-1), the average cross-product of the deviations of the individual values from their average or expectation. see also: correlation, expectation.
- A statistical measure of the tendency of two variables to change in conjunction with each other. it is equal to the product of their standard deviations and correlation coefficients.
- In programming languages, the ability to use a more derived type than that originally specified. covariance in generic interfaces and delegates allows for implicit conversion of generic type parameters. covariance is also supported for non-generic delegates for matching method signatures with delegate types. cover (n)
- A statistical measure of the degree to which random variables move together. a positive covariance implies that one variable is above (below) its mean value when the other variable is above (below) its mean value.
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