ABSTRACT We see master(prenominal)s of 3,813 companies using 60 monthly extends each twenty-four hour period of December 2001 and January 2002. The median(a) (average) of the maximal beta divided by the minimum beta was 3.07 (15.7). The median of the parcel daily point (in irresponsible value) of the betas was 20%. labor betas atomic number 18 too unstable. On average, the maximum beta of an industry was 2.7 quantify its minimum beta in December 2001 and January 2002. The median (average) of the percentage daily channelize (in absolute value) of the industry betas was 7% (16%). This dispersion of the calculated betas has every(prenominal)-important(a) implications for the instability of beta-ranked portfolios. JEL compartmentalisation: G12, G31, M21 October 16, 2008 (First version: July 7, 2004) * I would care to convey my research assistants Laura Reinoso and Leticia Alvarez for their wondrous help and Charles Porter for revising anterior manuscripts of this paper. I also would like to thank JosÃ© Manuel Campa, Rafael call and my colleagues at IESE for very face-saving comments and for their sharp questions that encouraged me to look for evaluation problems. 1 Pablo FernÃ¡ndez. IESE Business School ar calculated betas worth for anything? The beta is genius of the most important but elusive parameters in finance.
consort to the CAPM, it is a footmark of the so-called self-opinionated insecurity. We enjoin the diachronic beta from the anticipate beta, the historical beta organism the iodine we get from the infantile fixation of historical data, and the expected beta being the relevant unrivalled for estimating the cost of candour (the necessary return on equity). diachronic betas are used for some(prenominal) purposes: 1. 2. 3. To calculate the cost of equity of companies To rank pluss and portfolios with respect to systematic risk To test CAPM and mean-variance readiness We argue that historical betas (calculated from historical data) are useless for all three purposes. The capital asset set model (CAPM) defines the essential return to equity in the...If you requisite to get a full essay, order it on our website: Ordercustompaper.com
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