From Owen: An orthogonal array A
is a matrix of n
rows, k
columns with every element being one of q
symbols
0,...,q-1
. The array has strength t
if, in every n
by t
submatrix, the q^t
possible distinct rows, all appear
the same number of times. This number is the index
of the array, commonly denoted lambda
. Clearly,
lambda*q^t=n
. The notation for such an array is OA( n, k, q, t )
.