Although not as extensively studied as the theoretical models on auctions, the econo- metrics of auctions have gained significant an ever increasing attention in economics in the last two decades or so. The most important characterization of the methods used in the empirical analysis of auctions focuses on whether they use the structural econometric approach or the reduced form approach. In the structural approach the theoretical model is mapped seamlessly to the econometric model. In the reduced form approach, this is not true and the econometric model makes assumptions that are not necessarily exactly in line with the theoretical results.