Long Run Variance Estimation Using Steep Origin Kernels without Truncation
Peter Phillips (),
Yixiao Sun () and
No 1437, Cowles Foundation Discussion Papers from Cowles Foundation for Research in Economics, Yale University
A new class of kernel estimates is proposed for long run variance (LRV) and heteroskedastic autocorrelation consistent (HAC) estimation. The kernels are called steep origin kernels and are related to a class of sharp origin kernels explored by the authors (2003) in other work. They are constructed by exponentiating a mother kernel (a conventional lag kernel that is smooth at the origin) and they can be used without truncation or bandwidth parameters. When the exponent is passed to infinity with the sample size, these kernels produce consistent LRV/HAC estimates. The new estimates are shown to have limit normal distributions, and formulae for the asymptotic bias and variance are derived. With steep origin kernel estimation, bandwidth selection is replaced by exponent selection and data-based selection is possible. Rules for exponent selection based on minimum mean squared error (MSE) criteria are developed. Optimal rates for steep origin kernels that are based on exponentiating quadratic kernels are shown to be faster than those based on exponentiating the Bartlett kernel, which produces the sharp origin kernel. It is further shown that, unlike conventional kernel estimation where an optimal choice of kernel is possible in terms of MSE criteria (Priestley, 1962; Andrews, 1991), steep origin kernels are asymptotically MSE equivalent, so that choice of mother kernel does not matter asymptotically. The approach is extended to spectral estimation at frequencies omega
Keywords: Exponentiated kernel; Lag kernel; Long run variance; Optimal exponent; Spectral window; Spectrum (search for similar items in EconPapers)
JEL-codes: C22 (search for similar items in EconPapers)
Pages: 47 pages
New Economics Papers: this item is included in nep-ecm and nep-ets
Note: CFP 1178
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Published in Journal of Statistical Planning and Inference (2007), 137: 985-1023
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Working Paper: Long Run Variance Estimation Using Steep Origin Kernels Without Truncation (2004)
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