Piecewise Polynomial Representations of Genomic Tracks
Figure 2
Representations of mappability track of human chromosome 21.
MSE is mean square error between a model and the original track (solid lines, left scale). ICR is inverse compression ratio (dotted lines, right scale). Red points summarize performance of an approach averaging the track in windows of fixed width. Blue and green points summarize performance of PPCs with order 0 and 1, respectively. Points represent computed values, lines are drawn to show trend. The plot shows that for given ICR, the PPC models produce fits with lower mean square error than averages in fixed windows.