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Document Details : Title: An Extension of Mack's Model for the Chain Ladder Method Author(s): SCHMIDT, K.D. , SCHNAUS, A. Journal: ASTIN Bulletin Volume: 26 Issue: 2 Date: November 1996 Pages: 247-262 DOI: 10.2143/AST.26.2.563223 Abstract : The chain ladder method is a simple and suggestive tool in claims reserving, and various attempts have been made aiming at its justification in a stochastic model. Remarkable progress has been achieved by Schnieper and Mack who considered models involving assumptions on conditional distributions. The present paper extends the model of Mack and proposes a basic model in a decision theoretic setting. The model allows to characterize optimality of the chain ladder factors as predictors of non-observable development factors and hence optimality of the chain ladder predictors of aggregate claims at the end of the first non-observable calendar year. We also present a model in which the chain ladder predictor of ultimate aggregate claims turns out to be unbiased. |
