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Table 3 Concordance within replicates of same- and cross-species hybridizations to a human nylon cDNA microarray

From: Cross-species hybridisation of pig RNA to human nylon microarrays

Type of RNA Pearsona Spearmanb Weighted Kappac
Human, 4 μg 0.97 0.97 0.86
Pig, 2 μg 0.97 0.97 0.82
Pig, 4 μg 0.97 0.97 0.80
Pig, 6 μg 0.96 0.97 0.86
  1. aPearson correlation coefficient assumes data are normally distributed. bSpearman correlation coefficient assumes data are symmetrical. cThe weighted Kappa statistic assumes data are ordinal. . Pearson and Spearman correlation coefficients were calculated from median normalized and log transformed data. All genes were categorized according to their normalized expression level (undetectable, 0; low, 0 to 1.3; medium 1.3 to 3.0; or high, >3.0) for calculation of the weighted Kappa statistic. Results are the average of the three pairwise comparisons among three hybridizations of each type of RNA.