La quasi-ammissibilitá nella teoria generale delle decisioni

In questo lavoro, la nozione di quasi-ammissibilità, come ampliamento della nozione di ammissibilità, viene formalizzata esplicitando una topologia sullo spazio funzionale in cui sono immerse le funzioni di perdita corrispondenti alla classe di decisioni del problema. Per questa via è possibile analizzare il concetto di quasi-ammissibilità senza restrizioni sullo spazio degli stati di natura. Si verifica poi, che le nozioni già note di ε-ammissibilità costituiscono casi particolari del-l’impostazione più generale qui proposta.

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It is known that in Decision Theory under Uncertainty the notion of admissibility and almost-admissibility plays an important role since it does not depend properly on the chosen optimality criterion. The main goal of the known notions of ε-admissibility is to conveniently enlarge the class of the admissible decision rules, which for some problems can be empty. Once observed that the notion of ε-equivalence between two decision rules is based on the fact that the decision are “close” each other, it is then natural to study the notion of ε-equivalence in a topological context. Here the functional space of the loss functions associated to the class of the decision rules is equipped with the product topology which the functional space is naturally endoved of. It this framework it is possible to study the notion of almost-admissibility independently of the characteristics of the states space. The known definitions of ε-admissibility are then reduced to particular cases of this more general approach.

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Lavoro eseguito nell’ambito del Gruppo Nazionale per l’Analisi Funzionale e le sue Applicazioni del C.N.R.     

Asymptotic properties of MLE and UMVUE in one-parameter truncated distributions

Consider one-parameter families of continuous distributions whose range depend on an unknown parameter. In case a single sufficient and complete statistic exists, we obtain the limiting distributions of MLE and UMVUE. Both distributions are different transformations of a standard exponential variable.     

How and when environmental orientation drives corporate sustainable development in a cross-national buyer–supplier dyad

This study aims at relating the role of environmental orientation to corporate sustainable development within a cross-national buyer–supplier dyad. To this end, it specifically proposes and empirically tests a model delineating how the international buyer's environmental orientation would influence its green supplier development (GSD) activities, then its outsourcing supplier's green product strategies (GPS), and finally total relationship value (TRV) of the entire buyer–supplier dyad. It also examines how supplier overall information technology advancement (SOITA) would further moderate the aforementioned influences. Survey results derived from 202 buyer–supplier dyads have provided empirical support for all the hypothesized relationships of the proposed model. To summarize, the findings show that international buyers' internal and external environmental orientations both serve as a major driver for their GSD, which, in turn, significantly advances outsourcing suppliers' practice of GPS and consequently enhances TRV. Moreover, this study has demonstrated that SOITA exerts a significant and positive moderating effect on the GSD–GPS link. Overall, this study provides important insights into understanding the complex and contingent processes underlying the influence of the international buyer's environmental orientation on the joint performance of the dyad.