Abstract:
Empirical tests of APT have relied on factor analysis to estimate the risk factors. Here the authors propose a diff erent two-stage iterative methodology that relates risk factors to ex plicit economic variables. In the first stage, portfolio returns are regressed over time against these variables. In the second stage, a c ross-section regression is run across portfolios obtained in the firs t stage. The method is applied to 76 portfolios constructed from 760 securities traded on the London Stock Exchange between October 1977 a nd December 1983. Although experimental, four risk factors are identi fied: inflation, money supply, raw material prices, and interest rate s. Copyright 1988 by Blackwell Publishing Ltd
Oxford Bulletin of Economics and Statistics is edited by Christopher Adam, Anindya Banerjee, Christopher Bowdler, Gavin Cameron, David Hendry, Adriaan Kalwij, John Knight and Jonathan Temple