These evaluation measures were selected because recall and precision are not sensitive to variations of segment length contrary to the Pk measure (Beeferman et al., 1997) and do not favor segmentations with a few number of frontiers as WindowDiff (Pevzner and Hearst, 2002) (see (Niekrasz and Moore, 2010) for a rigorous analytical explanation of the biases of Pk and Win-dowDiff ).
while global methods override these drawbacks, they face the problem of over-segmentation due to the fact that they mainly rely on the sole lexical cohesion.