The Proportion of the Seasonal Period as a Season Index in Weekly Agricultural Data

  1. José Juan Cáceres Hernández 1
  2. Gloria Martín Rodríguez 1
  1. 1 Universidad de La Laguna

    Universidad de La Laguna

    San Cristobal de La Laguna, España

    GRID grid.10041.34

International Association of Agricultural Economists Conference (27º .2009. Beijing, China)

Publisher: International Association of Agricultural Economists

Year of publication: 2009

Type: Conference paper

Export: RIS


In this paper a seasonal model is proposed to deal with weekly agricultural seasonalpatterns in which neither the length of the seasonal period nor the magnitude of theseasonal effects remain the same over time. To model this heterogeneous seasonalbehaviour, the seasonal effect at a season is defined as a function of the proportion of thelength of the seasonal period elapsed up to this season, and the seasonal pattern is modelledby means of evolving splines. The methodology is illustrated for weekly Canary tomatoprices.

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