chi-square distribution

(redirected from Chi2 distribution)
Also found in: Medical, Encyclopedia.
Related to Chi2 distribution: Gamma distribution, T distribution, chi2 test

chi-square distribution

(ˈkaɪˌskwɛə)
n
(Statistics) statistics a continuous single-parameter distribution derived as a special case of the gamma distribution and used esp to measure goodness of fit and to test hypotheses and obtain confidence intervals for the variance of a normally distributed variable
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
The first two layers (7) and (8) of the proposed prior result in a generative Laplace (Gaussian-Exponential) distribution [26], and the last layer (i.e., a Chi2 distribution) is embedded to obtain the proposed three-layer Gauss-Exp-[Chi.sup.2] prior.
The reason for choosing the Gauss-Exp-[Chi.sup.2] prior is twofold: its pdf distribution has a sharp spike at the origin and heavy tails; it forms in a conjugate manner since the exponential and Chi2 distributions belonging to the exponential distribution family are chosen as the 2nd layer and the 3rd layer of this prior, which significantly simplifies the form of posterior distributions [24].