Figure 2

Evidence of overfitting from simulated data. Two-dimensional histogram for Hellinger Distance (vertical axis) and Pearson’s \(\chi ^2\) statistic (horizontal axis) for simulated data, where the plotted values have been aggregated over varying true values of \(c\) and \(\tau _2\). Fitting the biexponential directly gives the plot on the left, and using gamma conversion method gives the plot on the right. Intensity is graded from blue (lowest) to yellow (highest), white indicating no counts.