On the Use of Ranges, Cross-Ranges and Extremes in Comparing Small Samples
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IN ORDER to simplify and reduce the arithmetical work involved in analyses of statistical quality control, attempts have been made to derive useful substitutes for the ordinary methods of comparing two samples. Among these, a mention may be made of the quotient of two ranges or two mean ranges as alternatives to the variance ratio in testing for homogeneity in variation. In a recent article [3] Paul R. Rider presents the distribution of the quotient of two sample ranges, the universe being defined by the rectangular distribution. The purpose of the present article is to describe a procedure by which it is possible to test not only differences in variation but also differences in location. The method is based on the assumption of a rectangular universe. The definitions and the derivation of the sampling distributions are given in Sections 2-6. Section 7 shows the relation of the new test of variation to that studied by Rider. Section 8 gives a discussion of the proposed test statistics, indicating their usefulness and limitation. Section 9 explains the test tables given as an appendix. Finally, some numerical examples are presented in Section 10.
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近端估计与推断
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