Ivo Dinov
UCLA Statistics, Neurology, LONI
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Wilcoxon Rank-Sum Table

Probabilities relate to the distribution of WA, the rank sum for group A, when Ho : A = B is true. The tabulated value for the lower tail is the largest value of wA for which Pr(WA ≤ wA) ≤ prob. The tabulated value for the upper tail is the smallest value of wA for which pr(WA ≥ wA) ≤ prob. For sample sizes (nA & nA) larger than 12 use Normal Approximation and the Standard Normal Table to calculate critical values.

 Lower Tail

nA nB 0.005 0.01 0.025 0.05 0.10 0.20
4 4 . . 10 11 13 14
4 5 . 10 11 12 14 15
4 6 10 11 12 13 15 17
4 7 10 11 13 14 16 18
4 8 11 12 14 15 17 20
4 9 11 13 14 16 19 21
4 10 12 13 15 17 20 23
4 11 12 14 16 18 21 24
4 12 13 15 17 19 22 26
5 5 15 16 17 19 20 22
5 6 16 17 18 20 22 24
5 7 16 18 20 21 23 26
5 8 17 19 21 23 25 28
5 9 18 20 22 24 27 30
5 10 19 21 23 26 28 32
5 11 20 22 24 27 30 34
5 12 21 23 26 28 32 36
6 6 23 24 26 28 30 33
6 7 24 25 27 29 32 35
6 8 25 27 29 31 34 37
6 9 26 28 31 33 36 40
6 10 27 29 32 35 38 42
6 11 28 30 34 37 40 44
6 12 30 32 35 38 42 47
7 7 32 34 36 39 41 45
7 8 34 35 38 41 44 48
7 9 35 37 40 43 46 50
7 10 37 39 42 45 49 53
7 11 38 40 44 47 51 56
7 12 40 42 46 49 54 59
8 8 43 45 49 51 55 59
8 9 45 47 51 54 58 62
8 10 47 49 53 56 60 65
8 11 49 51 55 59 63 69
8 12 51 53 58 62 66 72
9 9 56 59 62 66 70 75
9 10 58 61 65 69 73 78
9 11 61 63 68 72 76 82
9 12 63 66 71 75 80 86
10 10 71 74 78 82 87 93
10 11 73 77 81 86 91 97
10 12 76 79 84 89 94 101
11 11 87 91 96 100 106 112
11 12 90 94 99 104 110 117
12 12 105 109 115 120 127 134
Upper Tail

nA nB 0.20 0.10 0.05 0.025 0.01 0.005
4 4 22 23 25
 26
 .
 .
4 5 25 26 28 29 30
 .
4 6 27 29 31 32 33 34
4 7 30 32 34 35 37 38
4 8 32 35 37 38 40 41
4 9 35 37 40 42 43 45
4 10 37 40 43 45 47 48
4 11 40 43 46 48 50 52
4 12 42 46 49 51 53 55
5 5 33 35 36 38 39 40
5 6 36 38 40 42 43 44
5 7 39 42 44 45 47 49
5 8 42 45 47 49 51 53
5 9 45 48 51 53 55 57
5 10 48 52 54 57 59 61
5 11 51 55 58 61 63 65
5 12 54 58 62 64 67 69
6 6 45 48 50 52 54 55
6 7 49 52 55 57 59 60
6 8 53 56 59 61 63 65
6 9 56 60 63 65 68 70
6 10 60 64 67 70 73 75
6 11 64 68 71 74 78 80
6 12 67 72 76 79 82 84
7 7 60 64 66 69 71 73
7 8 64 68 71 74 77 78
7 9 69 73 76 79 82 84
7 10 73 77 81 84 87 89
7 11 77 82 86 89 93 95
7 12 81 86 91 94 98 100
8 8 77 81 85 87 91 93
8 9 82 86 90 93 97 99
8 10 87 92 96 99 103 105
8 11 91 97 101 105 109 111
8 12 96 102 106 110 115 117
9 9 96 101 105 109 112 115
9 10 102 107 111 115 119 122
9 11 107 113 117 121 126 128
9 12 112 118 123 127 132 135
10 10 117 123 128 132 136 139
10 11 123 129 134 139 143 147
10 12 129 136 141 146 151 154
11 11 141 147 153 157 162 166
11 12 147 154 160 165 170 174
12 12 166 173 180 185 191 195




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