Identification and well-posedness in a class of nonparametric problems

Details Identification and well-posedness in a class of nonparametric problems Identification and well-posedness in a class of nonparametric problems

2010-10-13

arxiv.org/abs/1010.2737v1

Mathematics

Statistics Theory

Scientific paper

This is a companion note to Zinde-Walsh (2010), arXiv:1009.4217v1[MATH.ST], to clarify and extend results on identification in a number of problems that lead to a system of convolution equations. Examples include identification of the distribution of mismeasured variables, of a nonparametric regression function under Berkson type measurement error, some nonparametric panel data models, etc. The reason that identification in different problems can be considered in one approach is that they lead to the same system of convolution equations; moreover the solution can be given under more general assumptions than those usually considered, by examining these equations in spaces of generalized functions. An important issue that did not receive sufficient attention is that of well-posedness. This note gives conditions under which well-posedness obtains, an example that demonstrates that when well-posedness does not hold functions that are far apart can give rise to observable arbitrarily close functions and discusses misspecification and estimation from the stand-point of well-posedness.

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