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Improving Estimates Of Monotone Functions By Rearrangement

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Author Info
Victor Chernozhukov () (MIT, Department of Economics & Opperations Research Center, University College London and The University of Chicago)
Ivan Fernandez-Val () (Department of Economics, Boston University)
Alfred Galichon () (Harvard University, Department of Economics)

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Abstract

Suppose that a target function f0 : Rd ! R is monotonic, namely, weakly increasing, and an original estimate ^ f of the target function is available, which is not weakly increasing. Many common estimation methods used in statistics produce such estimates ^ f. We show that these estimates can always be improved with no harm using rearrangement techniques: The rearrangement methods, univariate and multivariate, transform the original estimate to a monotonic estimate ^ f¤, and the resulting estimate is closer to the true curve f0 in common metrics than the original estimate ^ f. We illustrate the results with a computational example and an empirical example dealing with age-height growth charts.

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File URL: http://www.bu.edu/econ/workingpapers/papers/Ivan%20Fernandez-Val/CFG-Approximation.pdf
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Publisher Info
Paper provided by Boston University - Department of Economics in its series Boston University - Department of Economics - Working Papers Series with number WP2007-012.

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Length: 31pages
Date of creation: Apr 2007
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Handle: RePEc:bos:wpaper:wp2007-012

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Related research
Keywords: Monotone function; improved approximation; multivariate rearrange- ment; univariate rearrangement; growth chart; quantile regression; mean regression; series; locally linear; kernel methods;

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  1. Henderson, Daniel J. & List, John A. & Millimet, Daniel L. & Parmeter, Christopher F. & Price, Michael K., 2008. "Imposing Monotonicity Nonparametrically in First-Price Auctions," MPRA Paper 8769, University Library of Munich, Germany. [Downloadable!]
  2. Victor Chernozhukov & Ivan Fernandez-Val & Alfred Galichon, 2007. "Rearranging Edgeworth-Cornish-Fisher expansions," CeMMAP working papers CWP19/07, Centre for Microdata Methods and Practice, Institute for Fiscal Studies. [Downloadable!]
  3. Victor Chernozhukov & Ivan Fernandez-Val & Alfred Galichon, 2008. "Improving point and interval estimates of monotone functions by rearrangement," CeMMAP working papers CWP17/08, Centre for Microdata Methods and Practice, Institute for Fiscal Studies. [Downloadable!]
  4. Henderson, Daniel J. & Parmeter, Christopher F., 2009. "Imposing Economic Constraints in Nonparametric Regression: Survey, Implementation and Extension," IZA Discussion Papers 4103, Institute for the Study of Labor (IZA). [Downloadable!]
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