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Table 4 Test for swapped plates. a) Plate r is seen here to have a problem, but from the table we see that it is most certainly not a plate rotation. b) A check of the distance matrix shows the {r, q} comparison to be quite good and satisfies the criteria for a match, indicating that plates r and q have been accidentally swapped.

From: A method for detecting and correcting feature misidentification on expression microarrays

a) A1 v B A2 v C A3 v D A4 v E
Plates R_{mm} R'_{mm} R_{mm} R'_{mm} R_{mm} R'_{mm} R_{mm} R'_{mm}
{i, i} 1 82 1 48 1 107 1 76
{j, j} 1 45 1 87 1 87 1 89
{k, k} 1 18 1 45 1 63 1 15
{l, l} 1 85 1 106 1 103 1 93
{m, m} 1 30 1 49 1 53 1 37
{n, n} 1 115 1 113 1 37 1 102
{o, o} 1 24 1 64 1 82 1 100
{p, p} 1 110 1 102 1 104 1 93
{q, q} 1 118 1 111 1 110 1 91
{r, r} 77 7 48 12 51 22 16 23
{s, s} 1 55 1 44 1 90 1 88
{t, t} 1 115 1 101 1 110 1 99
{u, u} 1 118 1 93 1 74 1 95
{v, v} 1 15 1 13 1 29 1 71
b) A1 v B A2 v C A3 v D A4 v E
  D_{mm} D_{mn} D_{mm} D_{mn} D_{mm} D_{mn} D_{mm} D_{mn}
MEAN 0.19 0.93 0.25 0.94 0.28 0.95 0.2 0.81
SD 0.14 0.07 0.19 0.07 0.17 0.07 0.16 0.1
{rq}   0.3   0.26   0.25   0.34
{rr} 0.97   0.95   0.98   0.72  
P-value 1.30E-08 0 1.10E-04 0 1.90E-05 0 5.80E-04 1.30E-06