Nijkamp P., Rossi E. and Vindigni G. (2004) Ecological footprints in plural: a meta-analytic comparison of empirical results, Regional Studies38, 747-765. The concept of an ecological footprint is intriguing and has prompted an avalanche of theoretical and applied research. In recent publications both the scientific basis and the policy relevance of this concept have been given ample attention, while also much empirical work has been undertaken to assess the value of the ecological footprint in different regions or countries of the world. The paper starts with a concise critical overview of the current discussion on ecological footprints. Its main aim, however, is to provide a meta-analytic assessment and interpretation of the various empirical findings in the recent literature that offer estimated values or ranges of the ecological footprint indicator. The sensitivity of ecological footprints for the stringent assumptions made in the calculation schemes is investigated using frequency analyses, cross- tabulation methods and decision-tree induction methods (a recent technique based on pattern recognition methods). The results show that methodological choice, geographical scales and year of data collection offer a significant explanation for variations in results. The paper concludes with some suggestions for further research. Nijkamp P., Rossi E. et Vindigni G. (2004) Des traces écologiques au pluriel: une comparaison méta- analytique des résultats empiriques, Regional Studies38, 747-765. La notion de traces écologiques est fascinante et a provoqué un flot de recherches fondamentale et appliquée. Dans des revues récentes on a prêté une attention particulière à la base scientifique de cette notion et à son importance pour la politique, alors que beaucoup de travail empirique a été fait aussi afin d'évaluer les traces écologiques dans diverses régions et dans de différents pays du monde. Dans un premier temps, cet article cherche à donner une vue d'ensemble critique et concise du débat actuel sur la notion de traces écologiques. Cependant, son but principal est de fournir une évaluation et une interprétation méta-analytiques des différentes preuves empiriques que l'on peut trouver dans la documentation récente et qui fournissent des estimations ou des approximations de l'indice des traces écologiques. La sensibilité des valeurs des traces écologiques pour ce qui est des suppositions rigoureuses faites dans les calculs sont examinées à partir des analyses de fréquences, des données croisées, et des méthodes d'induction par arbres de décisions (une technique récente fondée sur des méthodes d'identification de configuration). Les résultats laissent voir que le choix méthodologique, l'échelle géographique, et la collecte des données en fonction de l'an, fournissent une explication riche des variations des résultats. L'article conclut par proposer des recherches futures. Nijkamp P., Rossi E. und Vindigni G. (2004) Ökologische Fußspuren überall: ein meta-analytischer Vergleich empirischer Ergebnisse, Regional Studies38, 747-765. Der Begriff Ökologischer Fußspuren ist faszinierend, und hat eine wahre Lavine theoretischer und angewandter Forschung veranlaßt. In kürzlich verÖffentlichten Arbeiten hat man der wissenschaftlichen Grundlage und der politischen Relevanz dieser Vorstellung reichlich Aufmerksamkeit gezollt, während gleichzeitig viel empirische Arbeit unternommen wurde, um den Wert Ökologischer Fußspuren in verschiedenen Regionen oder Ländern der Welt zu beurteilen. Dieser Aufsatz beginnt mit einem knappen, kritischen überblick über die gegenwärtige Debatte über Ökologische Fußspuren. Sein Hauptziel ist jedoch, eine meta-analytische Beurteilung und Interpretation der verschiedenen empirischen Befunde der kürzlich verÖffentlichten Literatur vorzulegen, die Schätzwerte oder Reihen Ökologischer Fußspurenwerte anbieten. Die Sensitivität Ökologischer Fußspurenwerte für strenge Kriterien, die in Berechnungsschemen verlangt werden, werden untersucht, und zwar mit Hilfe von Frequenzanalysen, Kreuztabulierungsmethoden und Entscheidungsbaumverfahren (einer jü ngst entwickelten Technik, die sich auf Methoden der Musterverfahren stützt). Die Ergebnisse der Autoren zeigen, daß Wahl der Methodik, geographische Skalen und Jahr der Datensammlung signifikante Erklärungen für Abweichungen bei Ergebnissen liefern. Der Aufsatz schließt mit Vorschlägen für weitere Forschung. Nijkamp P., Rossi E. y Vindigni G. (2004) Huellas ecológicas en plural: una comparación meta-analítica de resultados empíricos, Regional Studies38, 747-765. El concepto de huella ecológica es intrigante y ha suscitado una avalancha de investigaciones teóricas y aplicadas. En recientes publicaciones se ha prestado una amplia atención tanto a la base científica como a la relevancia política de este concepto, mientras que también se ha llevado a cabo una gran cantidad de trabajo empírico con el fin de evaluar el valor de la huella ecológica en diferentes regiones y países del mundo. El presente artículo comienza con una breve revisión breve y concisa sobre el actual debate en torno a las huellas ecológicas. El objetivo principal de este artículo, sin embargo, es ofrecer una interpretación y evaluación meta-analítica de los varios resultados empíricos presentes en la literatura reciente que ofrecen valores o rangos estimados del indicador de huella ecológica. La sensibilidad de los valores atribuídos a la huella ecológica para las rigurosas suposiciones hechas en los esquemas de cálculo se investiga utilizando análisis de frecuencia, métodos de tablas cruzadas y métodos de inducción de árboles de decisión (una técnica reciente basada en métodos de reconocimiento de patrones). Nuestros resultados muestran que la elección metodológica, las escalas geográficas y el año de recolección de datos ofrecen una explicación significativa de las variaciones en los resultados. Este artículo concluye con algunas recomendaciones para futuras investigaciones.
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