covariant

共変の、共分散の

関

covariance

　

WordNet

1. changing so that interrelations with another variable quantity or set of quantities remain unchanged
2. (statistics) the mean value of the product of the deviations of two variates from their respective means

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/07/14 01:02:16」(JST)

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In mathematics and physics, covariance is a measure of how much two variables change together, and may refer to:

Statistics

• Covariance matrix, a matrix of covariances between a number of variables.
• Covariance or cross-covariance between two random variables or data sets.
• Autocovariance, the covariance of a signal with a time-shifted version of itself.
• Covariance function, a function giving the covariance of a random field with itself at two locations.

Geometry

• Covariance and contravariance of vectors, properties of how vector coordinates change under a change of basis.
• Covariance and contravariance of functors, properties of functors.

Computer science

• Covariance and contravariance (computer science), a system of class relations in computer science.

Physics

• General covariance or simply covariance (inaccurate but common usage in quantum mechanics), the invariance of the mathematical form of physical laws under arbitrary differential coordinate transformations (including Lorentz transformations), strictly meaning invariance
• Covariant transformation, a rule that describes how certain physical entities change under a change of coordinate system
• Lorentz covariance, a property of space-time that follows from the special theory of relativity
  • Poincaré covariance, a related property
• Eddy covariance, an atmospheric flux measurement technique

See also

• Covariance and correlation
• Covariance and contravariance (disambiguation)

English Journal

• An examination of the articulatory characteristics of prominence in function and content words using real-time magnetic resonance imaging.

• Yang Z, Ramanarayanan V, Byrd D, Narayanan S.SourceElec. Eng., Univ. of Southern California, 1124 W. 29th ST, Apt 2, Los Angeles, CA 90007zhaojuny@usc.edu.
• The Journal of the Acoustical Society of America.J Acoust Soc Am.2013 May;133(5):3567. doi: 10.1121/1.4806518.
• We examine the functional coupling between articulatory characteristics of prominence, such as articulator speed, and its acoustic characteristics, such as F0 and acoustic energy, for content words (nouns) and function words (e.g., articles, prepositions and conjunctions) using real-time magnetic re
• PMID 23655850

• Systematic Analysis of Enhancer and Critical cis-Acting RNA Elements in the Protein-Encoding Region of the Hepatitis C Virus Genome.

• Chu D, Ren S, Hu S, Wang WG, Subramanian A, Contreras D, Kanagavel V, Chung E, Ko J, Amirtham Jacob Appadorai RS, Sinha S, Jalali Z, Hardy DW, French SW, Arumugaswami V.SourceDepartment of Surgery, Cedars-Sinai Medical Center, Los Angeles, California, USA.
• Journal of virology.J Virol.2013 May;87(10):5678-96. doi: 10.1128/JVI.00840-12. Epub 2013 Mar 13.
• Hepatitis C virus (HCV) causes chronic hepatitis, cirrhosis, and liver cancer. cis-acting RNA elements of the HCV genome are critical for translation initiation and replication of the viral genome. We hypothesized that the coding regions of nonstructural proteins harbor enhancer and essential cis-ac
• PMID 23487449

• Regional covariance patterns of gray matter alterations in Alzheimer's disease and its replicability evaluation.

• Guo X, Chen K, Zhang Y, Wang Y, Yao L.SourceCollege of Information Science and Technology, Beijing Normal University, Beijing, China; National Key Laboratory of Cognitive Neuroscience and Learning, Beijing Normal University, Beijing, China.
• Journal of magnetic resonance imaging : JMRI.J Magn Reson Imaging.2013 Apr 15. doi: 10.1002/jmri.24143. [Epub ahead of print]
• PURPOSE: To identify regional network covariance patterns of gray matter associated with Alzheimer's disease (AD) and to further evaluate its replicability and stability.MATERIALS AND METHODS: This study applied a multivariate analytic approach based on scaled subprofile modeling (SSM) to structural
• PMID 23589138

Japanese Journal

• Near-Horizon Geometry and the Entropy of a Minimally Coupled Scalar Field in the Schwarzschild Black Hole

• Journal of the Physical Society of Japan 85(1), 2015-12-02
• NAID 160000000947

• Covariant density functional theory: Reexamining the structure of superheavy nuclei

• Physical review C 92(5), 054310, 2015-11
• NAID 120005689261

• Regeneration cycle and the covariant Lyapunov vectors in a minimal wall turbulence.

• Physical review E 92(2), 2015-08-24
• NAID 120005672620

Related Links

• Java共変戻り値メモ(Hishidama's Java covariant return type Memo)

共変戻り値型（covariant return type） 共変ってあんまり聞かない言葉だけど。 メソッドをオーバーライドした際、戻り値の型が（JDK1.4までは一致している必要があったが、JDK1.5から）サブクラスに出来るようになった。

• Covariant | Define Covariant at Dictionary.com

Covariant definition, (of one magnitude with respect to another) varying in accordance with a fixed mathematical relationship: The area of a square is covariant with the length of a side. See more. Thesaurus Translate Reference ...

Related Pictures

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★リンクテーブル★

リンク元	「共分散」「covariance」「共変」

「共分散」

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英

covariance、covariant

関

共変

「covariance」

　　[★]

• 共分散

関

covariant

　

「共変」

　　[★]

英

covariant

関

共分散