Percentage Points for the Cochran Test for Equality of Variances

Article

Solomon, Herbert; Stephens, Michael A.   (1990, ASQC)   Stanford University, Stanford, CA; Simon Fraser University, British Columbia, Canada

Journal of Quality Technology    Vol. 22    No. 1
QICID: 11289    January 1990    pp. 46-56
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Article Abstract

Tables are given for the distribution of a statistic for testing equality of variances where the intent is to discover if one variance is an outlier. These tables extend previously published tables. There is an obvious application to process control. It has become increasingly the practice to examine the variance as well as the mean in samples taken at different time points to check on the stability of the process. These tables should be helpful to the practitioner.

Keywords

Statistical methods,Tables,Statistical tests


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