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Keywords:

  • experimental design;
  • L18;
  • isomorphism class;
  • projection;
  • generalized word-length pattern

Abstract

All combinatorially inequivalent orthogonal arrays with 18 runs and eight or less factors are generated. Their potential as practical experimental designs is evaluated by a classification using generalized word-length patterns of the original arrays and those of their projections into less factors. Arrays of special interest are given explicitly. This paper includes the statistical analysis of results from a real-life experiment based on one of the arrays. Copyright © 2008 John Wiley & Sons, Ltd.