First Author:   Nils Hauenschild University of Hamburg hauen@econ.uni-hamburg.de   University of Hamburg, Institute for Statistics and Econometrics, Von-Melle-Park 5 Hamburg, 20146, Germany   +49-40-428383539(Phone) +49-40-428383539(Fax) http://www.rrz.uni-hamburg.de/IfStOek/index.htm Second Author: Peter Stahlecker University of Hamburg stahleck@econ.uni-hamburg.de   University of Hamburg, Institute for Statistics and Econometrics, Von-Melle-Park 5 Hamburg, 20146, Germany   +49-40-428384709(Phone) +49-40-428386326(Fax) http://www.rrz.uni-hamburg.de/IfStOek/index.htm