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	Provedor de dados AgEcon (3) Autor Hernandez, Jose Juan Caceres (2) Rodriguez, Gloria Martin (2) Caceres-Hernandez, Jose Juan (1) Martin-Rodriguez, Gloria (1) Palavra-chave Weekly data (3) C22 (2) International Relations/Trade (2) Q17 (2) Splines (2) Structural models (2) Canary tomato exports (1) Demand and Price Analysis (1) Evolving splines (1) Heterogeneous seasonal patterns (1) Research Methods/ Statistical Methods (1) Seasonality (1) Tenerife tomato exports (1) Mais... Tipo do documento Conference Paper or Presentation (3) Ano 2009 (1) 2005 (1) 2002 (1) País United States (3) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Evolving Seasonal Pattern of Tenerife Tomato Exports AgEcon Rodriguez, Gloria Martin; Hernandez, Jose Juan Caceres. The aim of this paper is to analyse the long term movements and, particularly, the seasonal pattern of Tenerife (Canary Islands) tomato exports throughout the last two decades. In order to observe more clearly the exporter's decisions, weekly data has been used. The instabilities in the long term behaviour of the series and the specific nature of the seasonal pattern should be taken into account in order to capture the performance of exports accurately. Thus, this analysis is carried out inside the frame delimited by the structural approach to time series and the usefulness of evolving splines as a tool capable of modelling seasonal variations in which either the period or the magnitude of the fluctuations do not remain the same over time is shown. Tipo: Conference Paper or Presentation Palavras-chave: Tenerife tomato exports; Weekly data; Structural models; Evolving splines; International Relations/Trade; C22; Q17. Ano: 2005 URL: http://purl.umn.edu/24501 The Proportion of the Seasonal Period as a Season Index in Weekly Agricultural Data AgEcon Martin-Rodriguez, Gloria; Caceres-Hernandez, Jose Juan. In this paper a seasonal model is proposed to deal with weekly agricultural seasonal patterns in which neither the length of the seasonal period nor the magnitude of the seasonal effects remain the same over time. To model this heterogeneous seasonal behaviour, the seasonal effect at a season is defined as a function of the proportion of the length of the seasonal period elapsed up to this season, and the seasonal pattern is modelled by means of evolving splines. The methodology is illustrated for weekly Canary tomato prices. Tipo: Conference Paper or Presentation Palavras-chave: Weekly data; Heterogeneous seasonal patterns; Splines; Demand and Price Analysis; Research Methods/ Statistical Methods; C22; Q17. Ano: 2009 URL: http://purl.umn.edu/49956 Canary Island Tomato Exports: A Structural Analysis of Seasonality AgEcon Rodriguez, Gloria Martin; Hernandez, Jose Juan Caceres. The European tomato market is characterised by a constant process of dynamic adjustment toward the equilibrium. Furthermore, Canary tomato exports cause a high seasonal impact on market prices in the winter period. In these circumstances, an adequate distribution of shipments throughout the campaign could contribute to maximize producers' profits. The goal of this paper is to analyse the seasonal pattern of Canary tomato exports to Europe throughout the first fourteen campaigns following Spanish integration into the European Union. These export levels show some degree of instability, clearly related to the changes in the European Union trade rules, and there is a long period, the summer, without exports. Moreover, we have opted by using weekly data. These... Tipo: Conference Paper or Presentation Palavras-chave: Canary tomato exports; Weekly data; Seasonality; Structural models; Splines; International Relations/Trade. Ano: 2002 URL: http://purl.umn.edu/24901 Registros recuperados: 3 Primeira ... 1 ... Última

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