Mimicking portfolios have long been useful in asset pricing research. In most empirical applications, the portfolio weights are assumed to be fixed over time, while in theory they may be functions of the economic state. This paper derives and characterizes mimicking portfolios in the presence of predetermined state variables, or conditioning information. The results generalize and integrate multifactor minimum variance efficiency (Fama, 1996) with conditional and unconditional mean variance efficiency (Hansen and Richard (1987), Ferson and Siegel, 2001). Empirical examples illustrate the potential importance of time-varying mimicking portfolio weights and highlight challenges in their application.
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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number
11020.
Length: Date of creation: Jan 2005 Date of revision: Handle: RePEc:nbr:nberwo:11020
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Find related papers by JEL classification: G1 - Financial Economics - - General Financial Markets G10 - Financial Economics - - General Financial Markets - - - General (includes Measurement and Data) G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions G12 - Financial Economics - - General Financial Markets - - - Asset Pricing G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies
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