Figure 5.

Receiver Operating Characteristic Curves for 2 cM IBD Segment Detection in UK Biobank Chromosome 20 Data

False-positive and false-negative rates for detection of identity by descent (IBD) segments over a range of output length thresholds around 2 centiMorgan (cM) for 5,000 UK Biobank samples. In order to allow for some discrepancy between reported and true lengths, false positives are assessed using true segments having length >1.5 cM, and false negatives are assessed using true segments having length >2.5 cM. IBD segments were detected with each method using length thresholds of 2 cM (plotted symbol) and with other thresholds between 1.6 and 2.4 cM (plotted lines; see Material and Methods). Figure S4 shows a similar plot for 5 cM.