1. A method for displaying relationships between concepts to provide classification suggestions via nearest neighbor, comprising the steps of: providing reference concepts each associated with a classification code and a set of uncoded concepts, wherein each of the reference concepts and the uncoded concepts comprises one or more nouns extracted from a plurality of documents; associating each reference concept with a symbol representing the classification code; comparing at least one uncoded concept with the reference concepts and identifying one or more of the reference concepts that are similar to the at least one uncoded concept; displaying relationships between the at least one uncoded concept and the similar reference concepts for classifying the at least one uncoded concept based on the classification symbols of the similar reference concepts comprising at least one of: displaying one or more of a presence and absence of the similar reference concepts with different classification codes; and displaying a quantity of the similar reference concepts for each of the different classification codes; providing at least one visual classification suggestion based on the displayed relationships; and receiving a classification code for the at least one uncoded concept from a human reviewer based on the at least one suggestion, wherein the steps are performed on a suitably programmed computer.