By slightly sacrificing the orthogonality requirement, we can obtain nearly orthogonal arrays with economic run size. Some general methods for constructing such arrays are given. For 12, 18, 20, and ...

C. DEVON LIN, RAHUL MUKERJEE, BOXIN TANG, Construction of orthogonal and nearly orthogonal Latin hypercubes, Biometrika, Vol. 96, No. 1 (MARCH 2009), pp. 243-247. Free online reading for over 10 ...