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Percentage Points for the Cochran Test for Equality of Variances

Summary: 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.

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  • Topics:
  • Keywords: Statistical methods,Tables,Statistical tests
  • Author: Solomon, Herbert; Stephens, Michael A.
  • Journal: Journal of Quality Technology