(1997)'s distance weighting approach.
the association score of o and s i is defined as:  where distance(o, s i ) is the dependency distance (see Section 3.4 for the details) between o and s i ; and μ is the parameter for decay rate determined by maximum likelihood estimate: where ) ( k p is the probability of the distance between o and s i being k. Since our goal is disambiguating opinion words in opinionated sentences, we should give product-feature words more influence on the translation selection than normal words.