In den 1980er Jahren löste die Befürchtung, dass der Wald aufgrund des Eintrags von anthropogenen Luftverunreinigungen wie Schwefeldioxid und Stickstoffoxiden großflächig absterben werde, die bis dato größte Umweltdebatte in der Bundesrepublik Deutschland aus, die bis heute vielfältig...

We discuss a weighted estimation of correlation and covariance matrices from historical financial data. To this end, we introduce a weighting scheme that accounts for the similarity of previous market conditions to the present situation. The resulting estimators are less biased and show lower...

An agent-based model for financial markets has to incorporate two aspects: decision making and price formation. We introduce a simple decision model and consider its implications in two different pricing schemes. First, we study its parameter dependence within a supply–demand balance setting....