Standard Orthogonal Arrays Maximum Maximum Number of Colum Orthogonal Number of Number of LL 92668572266 9 64 6 L
Standard Orthogonal Arrays Maximum Number of Columns Orthogonal at These Levels Array Number of Rows Maximum Number of Factors 2 3 4 5 L4 4 3 3 - - - L8 8 7 7 - - - L9 9 4 - 4 - - L12 12 11 11 - - - L16 16 15 15 - - - L’16 16 5 - - 5 - L18 18 8 1 7 - - L25 25 6 - - - 6 L27 27 13 1 13 - - L32 32 31 31 - - - L’32 32 10 1 - 9 - L36 36 23 11 12 - - L’36 36 16 3 13 - - L50 50 12 1 - - 11 L54 54 26 1 25 - - L64 64 63 63 - - - L’64 64 21 - - 21 - L81 81 40 - 40 - -