We thus devise an unsupervised method that discovers the canonical form(s) of a given idiomatic verb-noun pair by examining its frequency of occurrence in each syntactic pattern under consideration.
the set of the canonical form(s) of the target pair v, n is defined as Here, P is the set of patterns (see Table 1), and the condition z(v, n, pt k ) > T z determines whether the frequency of the target pair v, n in pt k is substantially higher than its frequency in other patterns; z(v, n, pt k ) is calculated using the statistic z-score as in Equation 8, and T z is a predefined threshold.