In con-   trast to precision and recall, these metrics allow for a slight vagueness in where the hypothesized thematic boundaries are placed and capture "the notion of nearness in a principled way, gently penalizing algorithms that hypothesize boundaries that aren't quite right, and scaling down with the algorithm's degradation" (Beeferman et al., 1999).
computing both P k and WindowDiff metrics involves the use of a fixed-size (i.e.