1. A computer-implemented process for building a classifier for associating an entity with a document, comprising: accessing a dictionary that maps entities to related terms; partitioning the dictionary by entity names to provide a set of partitions, each partition relating to an entity name; estimating, for a partition, a probability that is a function of a. a probability that an entity has the entity name related to the partition and b. an estimated size of a population larger than the dictionary; and creating a classifier for the partition including the estimated probability.