Apparatus, method and system for determining credit derivative indices and estimating credit derivative credit curves, and a credit calculator for valuing credit derivatives based on the credit curves

摘要

An apparatus, method and system for determining an estimate of at least one numerical attribute of at least one entity of a population when the population is changing and there are a limited number of observations on the attribute for the entities, in which a conditional index is determined to track how a value of the attribute changes from one time to another for an entity that is a member of the population at both times, and an unconditional index is determined representing an average level of the attribute for the entities of the population.