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Implicaciones en la utilización de una variable agregada para medir la producción de los aeropuertos españoles

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  • Roberto Rendeiro Martín-Cejas

    (Universidad de Las Palmas de Gran Canaria)

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    Abstract

    Un aspecto muy importante en el análisis econométrico de la función de producción (costes) en el ámbito de la economía del transporte es la definición de la variable que representa el output de la industria. La utilización de variables de producción inapropiadas conduce, en el peor de los casos, a conclusiones erróneas respecto a la tecnología en estudio. Problemas relacionados con la agregación de diferentes tipos de tráficos (pasajeros y carga), regiones y tamaños de las unidades de producción son destacados por la mayoría de los autores (véase Jara Díaz, 1982 y Harris, 1978). Otro factor relevante, también señalado en la literatura, se refiere a la correlación existente entre las diferentes medidas del output. La presenciade multicolinealidad entre las variables ocasiona que los coeficientes de regresión estimados no midan los efectos individuales sobre la variable respuesta sino que reflejan un efecto parcial sobre la misma que depende de todas las demás variables predictivas (independientes). En mayor medida, el objetivo de este estudio está relacionado con este último aspecto. Mediante la formulación de un modelo ad hoc de costes (véase Doganis y Thompson, 1973) pretendemos analizar las impllicaciones que tiene la utilización de una medida agregada de la producción para los aeropuertos españoles. One of the key issues in the econometric analysis of the production (cost) function in the field of transport economics is how the output measures are defined. The use of inappropiaate measures of output may induce wrong conclusions about technology. Aggregation of differente outputs (i.e. freight and passengers), regions of the country and sizes of production units are problems pointed out by literature (see Jara Díaz, 1982 and Harris, 1978). Another important aspect is the correlation between diferent output measures. Multicollinearity among parameters of the production (cost) function may induce bias on the estimated coeficients. Essentially the subject of this paper is related only to this last aspect. With an "ad hoc" cost function (see Doganis and Thompson, 1973) we will analyse the implications of an agregate output measure for spanish airport´s cost functions.

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    Bibliographic Info

    Article provided by Estudios de Economía Aplicada in its journal Estudios de Economía Aplicada.

    Volume (Year): 9 (1998)
    Issue (Month): (Junio)
    Pages: 159-169

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    Handle: RePEc:lrk:eeaart:9_2_9

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