Figure 3.

Comparing IBD Detection across Methods

The value on the y axis (rate of detected IBD) is determined by finding for each reported IBD segment the length of the overlap between the reported IBD segment and the best-matching (defined in Material and Methods) true IBD segment. If no true IBD segment overlaps the reported IBD segment, the amount of overlap is zero. Detection rate is the sum of all such overlap lengths divided by the number of pairs of individuals analyzed and by the total length of the regions analyzed. The value on the x axis (rate of false-positive IBD) is the sum of the lengths of false reported IBD segments divided by the number of pairs of individuals analyzed and by the total length of the regions analyzed. A reported segment is considered to be false if there is no true IBD segment that overlaps at least half of the reported segment.