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...

Deforestation is a large contributor to climate change. Controlling deforestation is difficult, especially because there are 484 million of hectares of forest that are community owned. In principle this arrangement could lead to a tragedy of the "commons", however there could be economies of...

We use a field experiment in Tanzania to compare the effectiveness on learning of two teacher performance pay systems. The first is a Pay for Percentile system (a rank-order tournament). The second rewards teachers based on multiple proficiency thresholds. Pay for Percentile can (under certain...

Factorial designs are widely used for studying multiple treatments in one experiment. While "long" model t-tests provide valid inferences, t-tests using the "short" model (ignoring interactions) yield higher power if interactions are zero, but incorrect inferences otherwise. Of 27 factorial...

The idea that complementarities across policies can yield increasing returns from joint implementation has been posited in several economic settings. Yet there is limited, well-identified evidence of such complementarities in practice. We present results from a randomized experiment across a...

Replication is a critical component of scientific credibility as it increases our confidence in the reliability of the knowledge generated by original research. Yet, replication is the exception rather than the rule in economics. In this paper, we examine why replication is so rare and propose...

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...