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The example data set consists of 20 paired samples from an ovarian cancer study in which a fresh-frozen tumor sample and peripheral blood sample were obtained from 10 female patients (Ramakrishna et al. 2010). All 20 samples were analyzed using the Affymetrix Genome Wide Human SNP Array 6.0. To download the data set, select this link - CNV Tutorial Data Set. The data set is a spreadsheet generated from the import of SNP6 CEL files and annotated with attributes for each sample. The experimental goal is to identify copy number variation between paired tumor and normal samples.