Multiple choice exams are frequently used as an efficient and objective instrument to evaluate knowledge. Nevertheless, they are more vulnerable to answer-copying than tests based on open questions. Several statistical tests (known as indices) have been proposed to detect cheating but to the...

This paper implements the answer-copying detection methodology for multiple-choice tests developed in Sotaridona, van der Linden and Meijer [2006], based on Cohen's Kappa index. We present results of this methodology applied to the standardized test for college admissions in Colombia that took...

By means of a suitable Bayesian game we study spot electricity markets from a structural point of view. We address the problem of individual and aggregate eficciency and we show how to value water from market observables. We compare the former to engineering methods and apply our methodology to...

El uso del mapeo de puntos calientes (hotspots) es una técnica descriptiva utilizada para identificar el lugar hacia dónde deberían dirigirse los recursos de prevención del crimen. Consiste en la identificación de áreas geográficas donde, en el pasado, ha habido delitos con mayor...

Defining optimal capital requirements for health insurers is a matter of interest for policy-makers. They determine the insolvency probability of health insurers and the minimum number of enrolees in order to keep insolvency under control. In this paper we develop a methodology for estimating...