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Efficient Estimation of Autoregression Parameters and Innovation Distributions forSemiparametric Integer-Valued AR(p) Models (Revision of DP 2007-23)

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Author Info

  • Drost, F.C.
  • Akker, R. van den
  • Werker, B.J.M.

    (Tilburg University, Center for Economic Research)

Abstract

Integer-valued autoregressive (INAR) processes have been introduced to model nonnegative integer-valued phenomena that evolve over time. The distribution of an INAR(p) process is essentially described by two parameters: a vector of autoregression coefficients and a probability distribution on the nonnegative integers, called an immigration or innovation distribution. Traditionally, parametric models are considered where the innovation distribution is assumed to belong to a parametric family. This 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 autoregression parameters and the innovation distribution.

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Bibliographic Info

Paper provided by Tilburg University, Center for Economic Research in its series Discussion Paper with number 2008-53.

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Date of creation: 2008
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Handle: RePEc:dgr:kubcen:200853

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Web page: http://center.uvt.nl

Related research

Keywords: count data; nonparametric maximum likelihood; infinite-dimensional Z-estimator; semiparametric efficiency;

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