The feature vector x associated with a collocation candidate represents the cooccurrence frequency information for this candidate: where O ij are the cell counts of a 2 × 2 contingency table (Evert, 2004).
we have a fourdimensional feature space Ω ⊆ R 4 , and each association measure defines a SF g : Ω → R. The selection of collocation candidates is usually made in the form of an n-best list, but may also be based on a pre-defined threshold γ.