Achieving a preventive attitude is the first step in eliminating cancer risk behaviours. This cross-sectional study evaluated the attitude towards the European Code against Cancer, in 3,031 relatives of cancer patients. The study looked for keys to improve attitude by means of educational interventions. Attitude was evaluated using a questionnaire with 63 items and a Likert's scale. Measured fr...

Gender effects remain poorly understood in the E-commerce setting. Using social roles theory, this research further investigates gender differences in consumer Web-based purchase decisions. Specifically, gender differences in the effects of interactivity, vividness, diagnosticity, and perceived risk on subsequent consumer attitude and online purchase intentions are investigated and explained. A...

Preferences are derived in part from knowledge. Knowledge, however, may be defeasible. We present an argumentation framework for deriving qualitative, multi-attribute preferences and incorporate defeasible reasoning about knowledge. Intuitively, preferences based on defeasible conclusions are not as strong as preferences based on certain conclusions, since defeasible conclusions may turn out no...

In this paper we analyze the equilibria structure of k-price auctions, k G 3, under the independent-private-value assumption. We discuss agents with an arbitrary attitude toward risk. That is, agents may be risk averse or risk seeking, or they may have an alternating attitude toward risk. We provide a characterization of a continuous symmetric equilibrium, prove that there exists at most one su...