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A multi sample test for the equality of coefficients of variation in normal populations

 

作者: R. Doornbos,   J.B. Dijkstra,  

 

期刊: Communications in Statistics - Simulation and Computation  （Taylor Available online 1983）
卷期: Volume 12, issue 2  

页码: 147-158

 

ISSN:0361-0918

 

年代: 1983

 

DOI:10.1080/03610918308812308

 

出版商: Marcel Dekker, Inc.

 

关键词: likelihood ratio test;noncentral t-distribution;chi-square approximations;comparisons Of power

 

数据来源: Taylor

 

摘要:

Two tests are derived for the hypothesis that the coefficients of variation of k normal populations are equal. The k samples may be of unequal size. The first test is the likelihood ratio test with the usual X2-approximation. A simulation study shows that the small sample behaviour under the null hypothesis is unsatisfactory. An alternative test, based on the sample coefficients of variation, appears to have somewhat better properties.

 

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