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Diskussionspapiere - Hannover Economic Papers (HEP)

How to Estimate Beta?

Autor: Fabian Hollstein and Marcel Prokopczuk and Chardin Wese Simen
Nummer: 617, Nov 2017, pp. 46
JEL-Class: G12, G11, G17

Abstract:
Researchers and practitioners face many choices when estimating an asset's sensitivities toward risk factors, i.e., betas. We study the effect of different data sampling frequencies, forecast adjustments, and model combinations for beta estimation. Using the entire U.S. stock universe and a sample period of more than 50 years, we find that a historical estimator based on daily return data with an exponential weighting scheme as well as a shrinkage toward the industry average yield the best predictions for future beta. Adjustments for asynchronous trading, macroeconomic conditions, or regression-based combinations, on the other hand, typically yield very high prediction errors.

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