The Altered Base Segment calculation takes all the CNV data for a single patient and first filters it for a segmentation mean of > 0.2 and, if specified, the minimum number of probes
covering that area. Then, it calculates the sums of the lengths of each segment for a particular patient and outputs that.
$$
Number\ of\ Altered\ Bases = \sum^{R}_{i = 1} d_i\ where\ |\bar{y}_{S_i}| \ge 0.2
$$