Análise harmônica de sazonalidade de produtos agrícolas no estado do Ceará

Abstract

The present work identifies and analises the seasonal behavior of the series of prices and the commercialized amount of horticulture products and fruits at the Central of Supplies of the State of Ceará (CEASA-CE). Secondary data corresponding to the montly price series and amounts commercialized on sale from january 1973 to december 1991 was used. The method used was the Harmonic Analysis. Only one seasonal cycle a year was observed in the price series of lettuce, banana, beetroot, carrot, Kale, orange, passion fruit, watermelon, red pepper, cabbage and tomato. The other analized products such as pumpkin, chayote and papaya did not show any definite seasonal pattern concerning price series. As to commercialized amount series, only five products: banana, beetroot, carrot, cabbage and tomato, showed the occurence of seasonal cycles, concerning then, only one cycle a year was observed. Banana, beetroot, carrot, cabbage and tomato showed the occurence of yearly seasonal cycles concerning both price series and amount series. All of the other products, when showing the occurence of seasonal cycles concerning price series did not show evidence of cycles concerning amount series and vice-verse; furthermore, they did not show any caracterized seasonal cycle pattern.