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Mixtures of Dirichlet-multinomials provide the best fits to genomic datasets. QQ plots evaluate the fit of three different models to (a) the CHM1 chromosome 21 RD dataset. (b) The CEU 2013 chromosome 21 TH dataset. The quantiles of the observed read count frequencies are calculated from the datasets, and the quantiles of the expected read count frequencies are estimated from the fitted model. A model that fits the data well produces points that fall along the diagonal
