| 释义 |
chi-squared distribution A type of non-negative continuous probability distribution, normally written as the χ2-distribution, with one parameter ν called the degrees of freedom. The distribution (see appendix 15) is skewed to the right and has the property that the sum of independent random variables each having a χ2-distribution also has a χ2-distribution. It is used in the chi-squared test for measuring goodness of fit, in tests on variance and in testing for independence in contingency tables. It has mean ν and variance 2ν.
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