Coöperatie in spelshows

In this chapter, we argue that game shows can be a useful source of data to study cooperative behavior. The unique combination of well-defined decision problems and large stakes makes game show data complementary to both experimental and field data. Over the past years, a number of TV shows have employed a vari- ant of the prisoner’s dilemma. We summarize the results of five different studies that use these shows to test a broad range of hypotheses. Finally, we discuss caveats of game show data, and contend that the potential problems are mostly not very different from those with experimental and field data

Coöperatie in spelshows

In this chapter, we argue that game shows can be a useful source of data to study cooperative behavior. The unique combination of well-defined decision problems and large stakes makes game show data complementary to both experimental and field data. Over the past years, a number of TV shows have employed a vari- ant of the prisoner’s dilemma. We summarize the results of five different studies that use these shows to test a broad range of hypotheses. Finally, we discuss caveats of game show data, and contend that the potential problems are mostly not very different from those with experimental and field data

The Wisdom of the Inner Crowd in Three Large Natural Experiments

The quality of decisions depends on the accuracy of estimates of relevant quantities. According to the wisdom of crowds principle, accurate estimates can be obtained by combining the judgements of different individuals 1,2. This principle has been successfully applied to improve, for example, economic forecasts 3-5, medical judgements 6-9 and meteorological predictions 10-13. Unfortunately, there are many situations in which it is infeasible to collect judgements of others. Recent research proposes that a similar principle applies to repeated judgements from the same person 14. This paper tests this promising approach on a large scale in a real-world context. Using proprietary data comprising 1.2 million observations from three incentivized guessing competitions, we find that within-person aggregation indeed improves accuracy and that the method works better when there is a time delay between subsequent judgements. However, the benefit pales against that of between-person aggregation: the average of a large number of judgements from the same person is barely better than the average of two judgements from different people

Cycle-finite module categories

We describe the structure of module categories of finite dimensional algebras over an algebraically closed field for which the cycles of nonzero nonisomorphisms between indecomposable finite dimensional modules are finite (do not belong to the infinite Jacobson radical of the module category). Moreover, geometric and homological properties of these module categories are exhibited

Experts aan het stuur - modelleren met ROC

De agrifood sector heeft te maken met een sterk concurrerende wereldmarkt. Innovatie is hierbij van levensbelang. Optimaal gebruikmaken van beschikbare kennis is een basisvoorwaarde voor innovatie. Kennis over de eigen business en kennis uit externe bronnen moeten in kaart worden gebracht en worden ontsloten. Binnen het Food Informatics project is onderzocht hoe Semantic Web technologie hiervoor gebruikt kan worden. Een belangrijke conclusie is dat relevante kennismodellen onmisbaar zijn om de aanwezige informatie te ontsluiten. Om het kostenefficiënt bouwen van kennismodellen mogelijk te maken is de ROC-methode ontwikkeld. ROC staat voor Rapid Ontology Construction en is een methode die speciaal ontworpen is om het kennismodelleringsproces efficiënter te make

Categorification of a frieze pattern determinant

Broline, Crowe and Isaacs have computed the determinant of a matrix associated to a Conway-Coxeter frieze pattern. We generalise their result to the corresponding frieze pattern of cluster variables arising from the Fomin-Zelevinsky cluster algebra of type A. We give a representation-theoretic interpretation of this result in terms of certain configurations of indecomposable objects in the root category of type A.Comment: 14 pages; 8 figures. Sections 1-3 rewritten, postponing the cluster interpretation until Section 3. Minor correction

Sex ratio evolution in a variable environment

We develop a natural selection model for sex ratio control in a spatially variable environment. Predictions of sex ratio alteration as a function of environmental change are tested in laboratory experiments with two parasitic wasps. Field data from a variety of other organisms also support the model. Finally, we discuss possibilities and difficulties for testing this type of evolutionary model

Can the Market Divide and Multiply? A Case of 807 Percent Mispricing

This paper documents a strong violation of the law of one price surrounding a large rights issue. If prices are right, the relation between the prices of shares and rights follows the outcome of a simple calculation. In the case of Royal Imtech N.V. in 2014, prices deviated sharply and persistently from the theoretical prediction. Throughout the term of the rights, investors were buying shares at prices that were many times what they should have been given the price of the rights. Short-selling constraints in the form of high recall risk and lacking stock lending supply are the most likely explanation for the failure of arbitrage as a safeguard of market efficiency. Still, it remains remarkable that investors were buying large volumes of shares at highly inflated prices in the presence of a cheap, perfect substitute