Sunspot Numbers
Mostrando 1-3 de 3 artigos, teses e dissertações.
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1. Analise de componentes ciclicas em series temporais uni e multivariadas via filtros HP modificados e outros metodos / Cycle components analysis for uni and multivariate time throug modified Hodrick-Prescott filters and other methods
The analysis of cycles in time series is considered in this investigation through four methodologies, of which three were more recently developed in literature. The first method, proposed in Kaiser and Maravall (2001), is based on a modification of the unidimensional Hodrick-Prescot filter (HP) through ARIMA models approach. The second method, developed in M
Publicado em: 2007
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2. EXTENSÃO DA COMPONENTE CÍCLICA DO MODELO ESTRUTURAL / EXTENDING THE CYCLICAL COMPONENT IN THE STRUCTURAL MODEL FORMULATION
The Structural Models, recently suggested by Harvey, uses the classic idea of modelling a time series y its non observed components. The cyclical component of the series, which is defined by a smoothed sine, is a special one that may be used for explaining a repetitive behaviour along the series. The motivation for using this component lies in the finite val
Publicado em: 1987
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3. Association between acute glaucoma and the weather and sunspot activity.
The dates of presentation of 191 cases of acute closed-angle glaucoma which presented at the Birmingham and Midland Eye Hospital between 1971 and 1974 were analysed and the seasonal incidence of acute glaucoma confirmed (P less than 0-001). These data were compared with meteorological data for air temperature, rainfall, hours of sunshine, atmospheric pressur