A Brief Look on the Literature on Deseasonalization

Abstract

This paper presents the issues related to seasonality patterns and deseasonalization procedures of economic variables. The paper concludes claiming that: (i) analysing long-term movements of economic time series separately from short-term ones may be useful for economic policy analysis; (ii) there is an yet unresolved difficulty in finding suitable definitions for the components; (iii) if the X-ll procedure is to be used, then the X-ll forecast plus current updating is suggested; (iv) there are several reasons for using seasonally unajusted data for econometric modelling rather than deseasonalized data.