11.07.2015 Views

séries univariantes de tempo - metodologia de Box & Jenkins

séries univariantes de tempo - metodologia de Box & Jenkins

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54Coeficiente <strong>de</strong> autocorrelação>k h 'o kp, = = = cp. qualquer kk y Y T JL , i MokNote-se que, como p, = i , a observação presente <strong>de</strong>pen<strong>de</strong> <strong>de</strong> todos o;valores passados, embora seu grau <strong>de</strong> <strong>de</strong>pendência <strong>de</strong>cline com o <strong>tempo</strong>.Consequentemente, o processo au to-regressi vo estacionario <strong>de</strong> prineiraor<strong>de</strong>m tem memória infinita.Processo Auto-Regressivo <strong>de</strong> Segunda Or<strong>de</strong>m: AR (2)Mo<strong>de</strong>lox t = «|, 1x t_ l +

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