Efficient estimation of auto-regression parameters and innovation distributions for semiparametric integer-valued AR("p") models
Integer-valued auto-regressive (INAR) processes have been introduced to model non-negative integer-valued phenomena that evolve over time. The distribution of an INAR("p") process is essentially described by two parameters: a vector of auto-regression coefficients and a probability distribution on the non-negative integers, called an immigration or innovation distribution. Traditionally, parametric models are considered where the innovation distribution is assumed to belong to a parametric family. The paper instead considers a more realistic semiparametric INAR("p") model where there are essentially no restrictions on the innovation distribution. We provide an (semiparametrically) efficient estimator of both the auto-regression parameters and the innovation distribution. Copyright (c) 2009 Royal Statistical Society.
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Volume (Year): 71 (2009)
Issue (Month): 2 ()
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