The following observations can be drawn from these experiments: (1) MUC and LEA are the only measures which give a zero score to the response that contains no correct coreference relations; (2) in our experiments, CEAF e shows an unreasonable drop when the correct link ratio changes from 0% to 20%; and (3), in Figure 2, the BLANC F 1 values are less than or equal to those of B 3 and LEA.
in Figure 3 that contains both coreferent and non-coreferent links, BLANC F 1 is at least 20% higher than that of other metrics.