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Heterogeneidad de preferencias y experimentos de eleccion: aplicacion de un logit con parametros aleatorios a la demanda de nueces

  • Camarena-Gomez, Dena M.
  • Sanjuan, Ana Isabel
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    RESUMEN En este artículo se examinan las preferencias declaradas de los consumidores hacia las nueces, mediante un experimento de eleccion, con un doble objetivo: primero, identificar los atributos más relevantes para el consumidor a la hora de adquirir este fruto y, segundo, estimar las posibilidades de introducción de la variedad Pecán. De ello se pueden obtener guías sobre la manera de incentivar el consumo y recomendaciones a las empresas comercializadoras. Los datos se analizaron mediante la estimación de un modelo logit mixto o con parámetros aleatorios, que permite relajar la propiedad de IIA (independencia de alternativas irrelevantes) presente en los modelos logit con parámetros fijos, al permitir que el coeficiente de cada atributo/nivel varíe aleatoriamente entre consumidores, reflejando así la heterogeneidad de las preferencias de los individuos. Asimismo, permite estimar eficientemente los parámetros cuando cada individuo elige varias veces, como en la presente investigación. Palabras clave: logit con parámetros aleatorios, preferencias declaradas, experimento de elección, nueces. ABSTRACT Consumers' stated preferences towards walnuts are studied by means of a choice experiment, with a double objective: first, to identify the main attributes searched by consumer at purchase and second, to analyse the chances for the introduction into the Spanish market of the Pecan variety. From this study, commercial guidelines may be derived, that helps distribution and import companies to commercialise this nut. A mixed or random parameters logit is estimated which relaxes the IIA property (independence of irrelevant alternatives) present in the logit model with fixed parameters. In a mixed logit, coefficients of each attribute/level vary randomly across consumers, reflecting the heterogeneity of individuals' preferences. This model also allows estimate efficiently the parameters when each individual chooses several times, as in the present study.

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    Article provided by Spanish Association of Agricultural Economists in its journal Economia Agraria y Recursos Naturales.

    Volume (Year): 04 (2004)
    Issue (Month): 08 ()

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    Handle: RePEc:ags:earnsa:28776
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