TY - CHAP TI - Modeling Aggregated Default Probabilities via Penalized Regression Methods AF - Workshop "Financial Markets & Risk'', Universität Innsbruck PP - Obergurgl PY - 2011-05-01 AU - Hofmarcher, Paul AU - Grün, Bettina AU - Hornik, Kurt AU - Kerbl, Stefan AU - Sigmund, Michael ER -