Fitting MA(q) Models in the Closed Invertible Region
classification
🧮 math.ST
stat.TH
keywords
boundaryestimatemodelbriefcloseddiscussedexperimentfitting
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The use of reparameterization in the maximization of the likelihood function of the MA(q) model is discussed. A general method for testing for the presence of a parameter estimate on the boundary of an MA(q) model is presented. This test is illustrated with a brief simulation experiment for the MA(q) for q=1,2,3,4 in which it is shown that the probability of an estimate being on the boundary increases with q.
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