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Structural analysis of portfolio risk using beta impulse response functions
Author(s) -
Hafner C. M.,
Herwartz H.
Publication year - 1998
Publication title -
statistica neerlandica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 39
eISSN - 1467-9574
pISSN - 0039-0402
DOI - 10.1111/1467-9574.00088
Subject(s) - econometrics , volatility (finance) , capital asset pricing model , impulse response , portfolio , beta (programming language) , economics , systematic risk , german , financial economics , stock (firearms) , mathematics , computer science , mechanical engineering , mathematical analysis , archaeology , engineering , history , programming language
We estimate the data generating process of daily excess returns of 20 major German stocks in a CAPM framework with time varying betas. Our sample spans a 23 year period from 1974 to 1996. An asymmetric dependence of volatility on lagged innovations is taken into account. We introduce beta impulse response functions to shed light on the structural implications of systematic risk associated with competing volatility models. The dependence of beta on news is characterized with respect to different sources (asset specific vs. market general news). The empirical results suggest that negative news emerging from the market involve a stronger impact on beta relative to positive news. Concerning firm specific news the opposite relation is found for the majority of the analysed data sets.