1. A computer implemented method comprising: measuring quantitatively the degree of concordance between or among two or more microarray data sets, comprising: summarizing the data obtained for each probe set present in a plurality of probe-level microarray data sets, wherein the summarizing comprises: discretizing each probe separately by comparing each probe value to the mean of the control values, resulting in a plurality of probe value calls wherein each of the plurality of probe value calls represents a distinct outcome or probability of an outcome; and performing majority logic decoding to summarize all repetitive probe value calls into a single call for each outcome; quantifying the degree of concordance between and/or among the summarized data from each probe-level microarray data set by utilizing a weighted variant of mutual information that assigns a particular weight reflecting the probability of an outcome; and using a scoring technique to measure the relative degree of concordance between or among the two or more data sets; and producing an output indicating the measured quantitative degree of concordance.