NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Testing Portfolio Efficiency with Conditioning Information

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Wayne E. Ferson, Andrew F. Siegel

NBER Working Paper No. 12098
Issued in March 2006
NBER Program(s):   AP

We develop asset pricing models' implications for portfolio efficiency when there is conditioning information in the form of a set of lagged instruments. A model of expected returns identifies a portfolio that should be minimum variance efficient with respect to the conditioning information. Our tests refine previous tests of portfolio efficiency, using the conditioning information optimally. We reject the efficiency of all static or time-varying combinations of the three Fama-French (1996) factors with respect to the conditioning information and also the conditional efficiency of time-varying combinations of the factors, given standard lagged instruments.

Published: "Testing Portfolio Efficiency with Conditioning Information," with Andrew F. Siegel, 2009, Review of Financial Studies (forthcoming).

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