Portfolio Inefficiency and the Cross-Section of Expected Returns
(237 K)
|
NBER Working Paper No. 4702
Issued in April 1994
NBER Program(s): AP
A plot of expected returns versus betas obeys virtually no relation to an inefficient index portfolio's mean-variance location. If the index portfolio is inefficient, then the coefficients and R- squared from an ordinary-least-squares regression of expected returns on betas can equal essentially any desired values. The mean-variance location of the index does determine the properties of a cross- sectional mean-beta relation fitted by generalized least squares (GLS). As the index portfolio moves closer to exact efficiency, the GLS mean-beta relation moves closer to the exact linear relation corresponding to an efficient portfolio with the same variance. The goodness-of-fit for the GLS regression is the index portfolio's squared relative efficiency, which measures closeness to efficiency in mean-variance space.
Published: Journal of Finance 50(1995):157-184.
This paper is available as PDF (237 K) or via email.
Machine-readable bibliographic record -
MARC,
RIS,
BibTeX
|
|
|
About
Support
The research activities of the NBER are funded by grants from federal research agencies, by private foundations, and by generous donations from our corporate associates and from private individuals. The NBER is a non-profit, 501(c)(3) organization. For information on supporting the NBER, please contact:
Mr. Denis Healy, Director of Development
NBER
1050 Massachusetts Avenue
Cambridge, MA 02138-5398
ph: 617-868-3900
email: dhealy@nber.org
Close
