Orthogonal Matrices for Taguchi Parameter Design Experiments
This section presents more technical details for the use of the reduced factorial or orthogonal matrix method so central to Taguchi Methods. The full nomenclature for an orthogonal array is La(bc), in which L stands for Latin square, a is the number of test trials, b is the number of levels for each column, and c is the number of columns in the array. An orthogonal matrix is a generalized Latin square. For example, the L4(23) orthogonal array is shown in Table 7.
Table 7 An L4(23) Orthogonal Array
Appendix B of the Robust Engineering Workshop Manual from the American Supplier Institute ...