Effective degrees of freedom and the likelihood ratio test
有效自由度与似然比检验AI 解读 ↓
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Normal-theory problems involving several unknown variances may require use of estimates not having simple chi-squared distributions. Confidence intervals are then commonly based on the use of ‘effective degrees of freedom’, i.e. the fitting of a gamma distribution via the first two moments, replacing parameters by estimates. The confidence intervals given by this method are compared with those resulting from the likelihood ratio test, inserting a Bartlett adjustment factor to achieve close approximation by a chi-squared distribution. Two special problems, one concerning components of variance and one a generalization of the Behrens-Fisher problem, are studied in detail.