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chi-square test for goodness-of-fit

См. также в других словарях:

  • 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

  • Pearson's chi-square test — Pearson s chi square ( chi;2) test is the best known of several chi square tests – statistical procedures whose results are evaluated by reference to the chi square distribution. Its properties were first investigated by Karl Pearson. In contexts …   Wikipedia

  • Chi-squared test — Chi square test is often shorthand for Pearson s chi square test. A chi square test, also referred to as chi squared test or χ2 test, is any statistical hypothesis test in which the sampling distribution of the test statistic is a chi square… …   Wikipedia

  • Goodness of fit — The goodness of fit of a statistical model describes how well it fits a set of observations. Measures of goodness of fit typically summarize the discrepancy between observed values and the values expected under the model in question. Such… …   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

  • Goodness-Of-Fit — Used in statistics and statistical modelling to compare an anticipated frequency to an actual frequency. Goodness of fit tests are often used in business decision making. In order to calculate a chi square goodness of fit, it is necessary to… …   Investment dictionary

  • Chi-squared distribution — This article is about the mathematics of the chi squared distribution. For its uses in statistics, see chi squared test. For the music group, see Chi2 (band). Probability density function Cumulative distribution function …   Wikipedia

  • test — 1. To prove; to try a substance; to determine the chemical nature of a substance by means of reagents. 2. A method of examination, as to determine the presence or absence of a definite disease or of some substance in any of the fluids, tissues,… …   Medical dictionary

  • G-test — In statistics, G tests are likelihood ratio or maximum likelihood statistical significance tests that are increasingly being used in situations where chi square tests were previously recommended.The commonly used chi squared tests for goodness of …   Wikipedia

  • Jarque-Bera test — In statistics, the Jarque Bera test is a goodness of fit measure of departure from normality, based on the sample kurtosis and skewness. The test statistic JB is defined as :mathit{JB} = frac{n}{6} left( S^2 + frac{(K 3)^2}{4} ight),where n is… …   Wikipedia

  • Degrees Of Freedom — In statistics, the number of values in a study that are free to vary. For example, if you have to take ten different courses to graduate, and only ten different courses are offered, then you have nine degrees of freedom. Nine semesters you will… …   Investment dictionary

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