Sampling Properties of Tests of Goodness-Of-Fit for Linear Autoregressive Schemes
线性自回归模型拟合优度检验的抽样性质AI 解读 ↓
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SUMMARY Sampling properties of tests for trend-free linear autoregressive schemes due to Bartlett and Diananda, to Quenouille, and to Whittle have been investigated. The investigation consists of the calculation of the first two moments of the various test-criteria which are χ2‘s with k degrees of freedom, where k is the number of asymptotically independent linear compounds on which the χ2‘s are based. The purpose is to examine the effect of the combination of individual constituents of χ2 on the validity of the test-criteria when the sample is not large. It has been demonstrated that when the sample is not very large, the contributions due to the terms involving k/n are considerable, a fact which confirms the empirical conclusions of Rao and Som (1951). In view of the apparent loss of validity thus entailed a modified test is suggested to be used when the sample size is small.