Standard Orthogonal Arrays
Maximum Number of Columns
at These Levels
Orthogonal
Array
Number of
Rows
Maximum
Number of
Factors 2 3 4 5
L
4
4 3 3 - - -
L
8
8 7 7 - - -
L
9
9 4 - 4 - -
L
12
12 11 11 - - -
L
16
16 15 15 - - -
L’
16
16 5 - - 5 -
L
18
18 8 1 7 - -
L
25
25 6 - - - 6
L
27
27 13 1 13 - -
L
32
32 31 31 - - -
L’
32
32 10 1 - 9 -
L
36
36 23 11 12 - -
L’
36
36 16 3 13 - -
L
50
50 12 1 - - 11
L
54
54 26 1 25 - -
L
64
64 63 63 - - -
L’
64
64 21 - - 21 -
L
81
81 40 - 40 - -