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april 2006 Smoothing Observational Data: A Philosophy and Implementation for the Health Sciences
Sander Greenland
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Internat. Statist. Rev. 74(1): 31-46 (april 2006).


Standard statistical methods (such as regression analysis) presume the data are generated by an identifiable random process, and attempt to model that process in a parsimonious fashion. In contrast, observational data in the health sciences are generated by complex, nonidentified, and largely nonrandom mechanisms, and are analyzed to form inferences on latent structures. Despite this gap between the methods and reality, most observational data analysis comprises application of standard methods, followed by narrative discussion of the problems of entailed by doing so. Alternative approaches employ latent-structure models that include components for nonidentified mechanisms. Standard methods can still be useful, however, provided their modeling philosophy is modified to encourage preservation of structure, rather than achieving parsimonious description. With this modification they can be viewed as smoothing or filtering methods for separating noise from signal before the task of latent-structure modeling begins. I here give a detailed justification of this view, and a hierarchical-modeling implementation that can be carried out with popular software. Concepts are illustrated in the smoothing of a contingency table from an analysis of magnetic fields and childhood leukemia.


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Sander Greenland. "Smoothing Observational Data: A Philosophy and Implementation for the Health Sciences." Internat. Statist. Rev. 74 (1) 31 - 46, april 2006.


Published: april 2006
First available in Project Euclid: 29 March 2006

zbMATH: 1012.68980

Keywords: bias , Empirical Bayes , Epidemiologic methods , Hierarchical regression , penalized likelihood , sensitivity analysis , smoothing

Rights: Copyright © 2006 International Statistical Institute


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Vol.74 • No. 1 • april 2006
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