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Fractionality and co-fractionality between Government Bond yields

Håvard Hungnes

Discussion Papers from Statistics Norway, Research Department

Abstract: In a co-fractional vector autoregressive (VAR) model two more parameters are estimated, compared to the traditional cointegrated VAR model. The increased number of parameters that needs to be estimated leads to identification problems; there is no unique formulation of a co-fractional system, though usually one formulation is preferred. This paper has the following contributions: (i) it discusses different kinds of identification problems in co-fractional VAR models; (ii) it proposes a specification test for higher order fractional processes; (iii) it presents an Ox program that can be used for estimating and testing co-fractional systems; and (iv) it uses the above mentioned contributions to analyse a system of Government Bonds in the US and Norway where the results indicates that the level and trend in the yield curve have a longer memory than the curvature (i.e., a linear combination of the yields of the Government Bonds that corresponds to representing the curvature of the yield curve is a co-fractional relationship).

Keywords: Fractional; cointegration (search for similar items in EconPapers)
JEL-codes: C32 E43 (search for similar items in EconPapers)
Pages: 25
Date: 2016-04
New Economics Papers: this item is included in nep-mac and nep-ore
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