This monograph presents the work of three groups of experts addressing the use of single-factor models to explain security Edwin Burmeister, Richard Roll, and Stephen Ross explain the basics of Arbitrage Pricing Theory and discuss the macroeconomic forces that are the underlying sources of risk; Edwin J. Elton and Martin J. Gruber present multi-index models and provide guidance on their reliability and usefulness; and Richard C. Grinold and Ronald N. Kahn address multiple-factor models for portfolio risk.
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