Template-type: ReDIF-Paper 1.0
Author-Name: David Hendry
Author-Email: david.hendry@nuffield.ox.ac.uk
Author-Homepage:http://www.nuff.ox.ac.uk/economics/people/hendry.htm 
Author-Workplace-Name:Nuffield College, Oxford University
Author-Workplace-Homepage:http://www.nuff.ox.ac.uk/nuffield.html
Author-Name: Maozu Lu
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Author-Workplace-Name: Economics Department, Southampton University
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Author-Name: Grayham E. Mizon
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Author-Workplace-Name: Economics Department, Southampton University
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Title: Model Identification and Non-unique Structure
Abstract:
  Identification is an essential attribute of any model's
  parameters, so we consider its three aspects of 'uniqueness',
  'correspondence to reality' and 'interpretability'.
  Observationally-equivalent over-identified models can co-exist,
  and are mutually encompassing in the population; correctly-identified
  models need not correspond to the underlying structure; and may be
  wrongly interpreted.  That a given model is over-identified with all
  over-identifying restrictions valid (even asymptotically) is
  insufficient to demonstrate that it is a unique representation.
  Moreover, structre (as invariance under extended information) need
  not be identifiable.  We consider the role of structural breaks to
  discriminate between such representations.
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Length:16 pages
Creation-Date: 2001-05-01
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Number:2002-W10
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File-URL:http://www.nuff.ox.ac.uk/economics/papers/2002/w10/DEISTGEM.pdf
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Handle: RePEc:nuf:econwp:0210