Question: A prominent beta estimation service reports the beta of Comcast
A prominent beta estimation service reports the beta of Comcast Corporation, a major cable TV operator, to be 1.45. The service claims to use weekly returns on the stock over the prior five years and the NYSE composite as the market index to estimate betas. You replicate the regression using weekly returns and the same index over the same period and arrive at a beta estimate of 1.60. How would you reconcile the two estimates?
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