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The performance of robust two-stage estimator in nonlinear regression with autocorrelated error.


Riazoshams, Hossein and Midi, Habshah and Sh. Sharipov, Olimjon (2010) The performance of robust two-stage estimator in nonlinear regression with autocorrelated error. Communications in Statistics: Simulation and Computation, 39 (6). pp. 1251-1268. ISSN 0361-0918 print/1532-4141 online

Abstract / Synopsis

Some statistics practitioners often ignore the underlying assumptions when analyzing a real data and employ the Nonlinear Least Squares (NLLS) method to estimate the parameters of a nonlinear model. In order to make reliable inferences about the parameters of a model, require that the underlying assumptions, especially the assumption that the errors are independent, are satisfied. However, in a real situation, we may encounter dependent error terms which prone to produce autocorrelated errors. A two-stage estimator (CTS) has been developed to remedy this problem. Nevertheless, it is now evident that the presence of outliers have an unduly effect on the least squares estimates. We expect that the CTS is also easily affected by outliers since it is based on the least squares estimator, which is not robust. In this article, we propose a Robust Two-Stage (RTS) procedure for the estimation of the nonlinear regression parameters in the situation where autocorrelated errors come together with the existence of outliers. The numerical example and simulation study signify that the RTS is more efficient than the NLLS and the CTS methods.

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Additional Metadata

Item Type: Article
Subject: Parameter estimation.
Subject: Mathematical statistics.
Divisions: Faculty of Science
DOI Number: 10.1080/03610918.2010.490316
Publisher: Taylor & Francis
Keywords: Autocorrelated error; Nonlinear regression; Outliers.
Depositing User: Najwani Amir Sariffudin
Date Deposited: 25 Jun 2012 08:55
Last Modified: 02 Nov 2015 15:42
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