New arma models for Wolfer’s sunspot data

Abstract
In this paper new ARMA models for the yearly sunspot numbers are obtained using the R- and S- arrays of Gray, Kelley, and Mclntire (1978). The models obtained are nonstationary and nearly nonstationary ARMA (8, 1) models. These new models are shown to be superior to the well-known ARMA (2, 0) model suggested by the Box-Jenkins approach.

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