D-optimal orthogonal array minus t run designs

© 2018, © 2018 Grace Scientific Publishing, LLC. This article considers the design performance of orthogonal arrays in which one or more runs are missing at random. We focus on orthogonal arrays of index unity and on the 18 run ternary arrays

All Orthogonal Arrays with 18 Runs

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. © 2008 John Wiley & Sons, Ltd