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Column: Technical Aids: Using Nested Designs: I. Estimation of Standard Deviations

Summary: [Abstract from first paragraph of article]

Everyone wants to know, or should want to know, how much variation exists in various parts of a process. Given that a primary consideration in process quality improvement is reduction in variation, it becomes important to have estimates of the various sources of variation. The difficulty is that estimates that are nested are "contaminated" by the variances of the stages nested below them. Part I of this tutorial will show how to separate these variances for ultimately estimating standard deviations when using nested designs.

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  • Topics: Design of Experiments, Statistics
  • Keywords: Analysis of variance (ANOVA),Confidence limits,Estimation,Nested experiments,Standard deviation,Statistics,Variation
  • Author: Nelson, Lloyd S.
  • Journal: Journal of Quality Technology