Rank ranges: We split each of the three rank lists (U U R, ground truth and baseline) into five different equal-sized ranges as follows -(i) surely borrowed (SB) containing top 20% words from each list, (ii) likely borrowed (LB) containing the next 20% words from each list, (iii) borderline (BL) constituting the subsequent 20% words from each list, (iv) likely mixed (LM) comprising the next 20% words from each list and (v) surely mixed (SM) having the last 20% words from each rank list.
we have three sets of five buckets, one set each for U U R, the ground truth and the baseline based rank list.