Este trabajo utiliza la Ley de Newcomb-Benford y las pruebas de Beber y Scacco para analizar las elecciones presidenciales desde 1958 hasta el 2006, las presidenciales de 1922, las elecciones de Congreso en 2010, y las votaciones para Alcalde en Cali del 2007. Este es el primer estudio y...

Este trabajo utiliza la Ley de Newcomb-Benford y las pruebas de Beber y Scacco para analizar las elecciones presidenciales desde 1958 hasta el 2006, las presidenciales de 1922, las elecciones de Congreso en 2010, y las votaciones para Alcalde en Cali del 2007. Este es el primer estudio y...

Este documento describe la metodología utilizada para implementar el índice ω a las pruebas SABER 5◦ y 9◦ realizadas por el ICFES en el 2009. Para validar la utilización de este índice se calculan el error tipo I y II. Adicionalmente, se comparan el índice ω y el índice κ en...

Este trabajo implementa la metodología de detección de copia en exámenes de múltiples opciones expuesta en Sotaridona, van der Linden y Meijer [2006] basada en el índice Kappa de Cohen. Presentamos los resultados de aplicar esta metodología a las pruebas del Estado ICFES 2009 II. Este es,...

There has been so much debate on the increasing use of formal methods in Economics. Although there are some studies tackling these issues, those use either a little amount of papers, a small amount of scholars or a short period of time. We try to overcome these challenges constructing a database...

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...

We introduce new risk groups to a standard capitation formula and evaluate risk selection incentives of insurers. The study uses a unique data set of almost 24 million affiliates to Government’s mandatory health insurance system. This data set is very rich in the sense of reporting all claims...

In Ghana there is a highly developed apprenticeship system where young men and women undertake sector-specific private training, which yields skills used primarily in the informal sector.  In this paper we use a 2006 urban based household survey with detailed questions on the background,...

The recent wave of randomized trials in development economics has provoked criticisms regarding external validity.  We investigate two concerns - heterogeneity across beneficiaries and implementers - in a randomized trial of contract teachers in Kenyan schools.  The intervention, previously...

The size of the informal sector is commonly associated with low per capita GDP and a poor business environment.  Recent episodes of reform and growth in several African countries appear to contradict this pattern.  From the mid 1980's onward, Ghana underwent dramatic liberalization and...