Error coding and PaCT's

A new class of plug in classi cation techniques have recently been developed in the statistics literature. A plug in classi cation technique (PaCT) is a method that takes a standard classi er (such as LDA or nearest neighbors) and plugs it into an algorithm to produce a new classi er. The standard classi er is known as the Plug in Classi er (PiC). These methods often produce large improvements over using a single classi er. In this paper we investigate one of these methods and give some motivation for its success.