chi-square

chi-square
A statistical technique whereby variables are categorized to determine whether a distribution of scores is due to chance or experimental factors.

* * *

(kiґskwār) see under distribution and test.

Medical dictionary. 2011.

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  • chi-square — chi′ square [[t]ˈkaɪ[/t]] n. sta a statistical quantity equal to the summation over all variables of the quotient of the square of the difference between the observed and expected values divided by the expected value of the variable • Etymology:… …   From formal English to slang

  • chi-square — [kī′skwer′] n. a statistical method used to test whether the classification of data can be ascribed to chance or to some underlying law …   English World dictionary

  • chi-square — noun A test statistic used in the chi square test …   Wiktionary

  • Chi-square test — is often shorthand for Pearson s chi square test. A chi square test (also chi squared or chi^2 test) is any statistical hypothesis test in which the test statistic has a chi square distribution when the null hypothesis is true, or any in which… …   Wikipedia

  • chi-square test — chi′ square (or chi′ squared ) test n. sta a test that uses the quantity chi square for testing the mathematical fit of a frequency curve to an observed frequency distribution • Etymology: 1935–40 …   From formal English to slang

  • chi square test — chi kvadrato kriterijus statusas T sritis biomedicinos mokslai apibrėžtis ↑Statistinis kriterijus, dažniausiai taikomas tikrinant ↑kokybinių kintamųjų ryšio hipotezes. atitikmenys: angl. chi square test ryšiai: sinonimas – χ² kriterijus šaltinis… …   Lithuanian dictionary (lietuvių žodynas)

  • Chi Square — Chi Quadrat (χ2) ist eine Testgröße, mittels der ein Signifikanztest (auch: statistischer Test), der Chi Quadrat Test, durchgeführt wird. Der Chi Quadrat Test basiert auf dem Vergleich zwischen erwarteten und beobachteten Werten zweier Merkmale… …   Deutsch Wikipedia

  • Chi-square distribution — Probability distribution name =chi square type =density pdf cdf parameters =k > 0, degrees of freedom support =x in [0; +infty), pdf =frac{(1/2)^{k/2{Gamma(k/2)} x^{k/2 1} e^{ x/2}, cdf =frac{gamma(k/2,x/2)}{Gamma(k/2)}, mean =k, median… …   Wikipedia

  • chi-square test — Statistics. a test devised by Karl Pearson that uses the quantity chi square for testing the mathematical fit of a frequency curve to an observed frequency distribution. Also, chi squared test /kuy skwaird /. [1935 40] * * * chi square test UK… …   Useful english dictionary

  • Chi-square target models — Swerling models were introduced by Peter Swerling and are used to describe the statistical properties of the radar cross section of complex objects.General Target ModelSwerling target models give the RCS of a given object based on the chi square… …   Wikipedia

  • Chi Square Statistic — A measurement of how expectations compare to results. The data used in calculating a chi square statistic must be random, raw, mutually exclusive, drawn from independent variables and be drawn from a large enough sample. For example, the results… …   Investment dictionary

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