chi-square test

chi-square test
any statistical hypothesis test that employs the chi-square (χ2) distribution (q.v.), especially two tests applied to categorical data: the χ2-test of goodness of fit, which tests whether an observed frequency distribution fits a specified theoretical model, and the χ2-test of independence or homogeneity, which tests whether two or more series of frequencies (the rows and columns of a contingency table) are independent. In both cases the test statistic is the sum over all categories of the squared difference between the observed and expected frequencies divided by the expected frequency, under the null hypothesis. The sampling distribution of this χ2-statistic approaches the χ2-distribution as the sample size increases, under the null hypothesis.

Medical dictionary. 2011.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • 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 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 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 test — UK [ˈkaɪ skweə(r) ˌtest] / US [ˈkaɪ skwer ˌtest] noun [countable] Word forms chi square test : singular chi square test plural chi square tests maths a test used in statistics to find out how accurate a theory was by comparing it with the actual… …   English dictionary

  • 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 — 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] * * * …   Universalium

  • chi-square test — noun any statistical hypothesis test in which the test statistic has a chi square distribution if the null hypothesis is true …   Wiktionary

  • chi-square test — /ˈkaɪ skwɛə ˌtɛst/ (say kuy skwair .test) noun Statistics a test devised to assess the mathematical goodness of fit of a frequency curve to an observed frequency distribution …  

  • chi-square test — a statistical method assessing the goodness of fit between a set of observed values and those expected theoretically. → chi …   English new terms dictionary

  • chi-square test — ( 2)    A statistical test to determine how closely an observed set of data values correspond to the values expected, under a specific hypothesis …   Forensic science glossary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”