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ESTIMATION OF THE LONG-RUN AVERAGE RELATIONSHIP IN NONSTATIONARY PANEL TIME SERIES
Published online by Cambridge University Press: 01 December 2004
Abstract
This paper proposes a new class of estimators of the long-run average
relationship in nonstationary panel time series. The estimators are
based on the long-run average variance estimate using bandwidth equal
to T. The new estimators include the pooled least squares
estimator and the fixed effects estimator as special cases. It is shown
that the new estimators are consistent and asymptotically normal under
both the sequential limit, wherein T → ∞ followed
by n → ∞, and the joint limit where
T,n → ∞ simultaneously. The rate condition
for the joint limit to hold is relaxed to
,
which is less restrictive than the rate condition n/T
→ 0, as imposed by Phillips and Moon (1999, Econometrica 67, 1057–1111).
By exponentiating existing kernels, this paper introduces a new
approach to generating kernels and shows that these exponentiated
kernels can deliver more efficient estimates of the long-run average
coefficient.I am grateful to Bruce Hansen,
Peter Phillips, Zhijie Xiao, and three anonymous referees for constructive
comments and suggestions. All errors are mine alone.
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- Research Article
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- © 2004 Cambridge University Press
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