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Ermilson Velasquez

EAFIT University

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Publication

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Journal of Geographical Systems | 2011

A computationally efficient method for delineating irregularly shaped spatial clusters

Juan C. Duque; Jared Aldstadt; Ermilson Velasquez; José Luis Barrera Franco; Alejandro Betancourt

In this paper, we present an efficiency improvement for the algorithm called AMOEBA, A Multidirectional Optimum Ecotope-Based Algorithm, devised by Aldstadt and Getis (Geogr Anal 38(4):327–343, 2006). AMOEBA embeds a local spatial autocorrelation statistic in an iterative procedure in order to identify spatial clusters (ecotopes) of related spatial units. We provide an analysis of the computational complexity of the original AMOEBA and develop an alternative formulation that reduces computational time without losing optimality. Empirical evidence is provided using georeferenced socio-demographic data in Accra, Ghana.

Archive | 2016

Determinantes Del Precio De La Vivienda Nueva No Vis En Medellín: Un Modelo Estructural (Price Determinants of No VIS New Housing In Medellin: A Structural Model)

John J. García; Sebastián Díaz; Juan Carlos Upegui; Ermilson Velasquez

Archive | 2015

Efectos Del Cargo Por Confiabilidad Sobre El Precio Spot De La Energía Eléctrica En Colombia (Impact of Electricity Generation Reliability on the Colombian Spot Price)

Juan Pablo Botero; John J. García; Ermilson Velasquez

Archive | 2015

Efectos espaciales en la formación de precios en mercados minoristas de Gas Natural Vehicular (Spatial Effects in Prices in Natural Gas Retail Markets)

John J. García; Carlos Mauricio Montenegro; Ermilson Velasquez

DOCUMENTOS DE TRABAJO CIEF | 2015

Efectos del cargo por confiabilidad sobre el precio spot de la energía eléctrica en Colombia

Juan Pablo Botero; John J. García; Ermilson Velasquez

Archive | 2014

APT - evidencia empírica en el análisis del ROA en una empresa de servicios públicos domiciliarios de acueducto y alcantarillado

Raúl A. Cardona; Ermilson Velasquez; Tatiana María Vidal; Raúl Alberto Escobar

Archive | 2014

Efecto De Los Ingresos Permanentes Sobre El Delito: Un Enfoque Espacial Y Un Caso De Aplicación (Effect of Permanent Income on Crime: A Spatial Approach and Case Application)

Catalina Gomez; Ermilson Velasquez; Joaquin A. Urrego; Juan David Valderrama

Archive | 2014

APT - Evidencia Empírica En El Análisis Del ROA En Una Empresa De Servicios Públicos Domiciliarios De Acueducto Y Alcantarillado (APT - Empirical Evidence in the Analysis of the Return on Assets (ROA) in a Business of Residential Public Services of Aqueduct and Sewerage)

Raúl Armando Cardona Montoya; Ermilson Velasquez; Tatiana María Vidal; Raúl Alberto Escobar

Archive | 2013

Matching Laboral: Una Aproximación Emprírica Y Metodológica (Labor Matching: An Empirical and Methodological Approximation )

Alvaro Hurtado; Ermilson Velasquez; Gustavo J. Canavire Bacarreza; Luisa Fernanda Rubiano; Esteban Isaza

Revista Ingenierías Universidad de Medellín | 2012

Matrices de transición en el análisis del riesgo crediticio como elemento fundamental en el cálculo de la pérdida esperada en una institución financiera colombiana

Armando Támara-Ayús; Raúl Aristizábal; Ermilson Velasquez

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John J. García

EAFIT University

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Alberto Jaramillo

EAFIT University

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Javier Santiago Ortiz

EAFIT University

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Juan Pablo Botero

EAFIT University

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Raúl Alberto Escobar

EAFIT University

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Tatiana María Vidal

EAFIT University

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Alejandro Betancourt

EAFIT University

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Alvaro Hurtado

EAFIT University

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Armando Támara-Ayús

EAFIT University

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Catalina Gomez

EAFIT University

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