Nonparametric quasi-likelihood
Journal
The Annals of Statistics
Journal Volume
27
Journal Issue
1
ISSN
0090-5364
Date Issued
1999-03-01
Author(s)
Hans-Georg Müller
Abstract
The quasi-likelihood function proposed by Wedderburn broadened the scope of generalized linear models by specifying the variance function instead of the entire distribution. However, complete specification of variance functions in the quasi-likelihood approach may not be realistic. We define a nonparametric quasi-likelihood by replacing the specified variance function in the conventional quasi-likelihood with a nonparametric variance function estimate. This nonparametric variance function estimate is based on squared residuals from an initial model fit. The rate of convergence of the nonparametric variance function estimator is derived. It is shown that the asymptotic limiting distribution of the vector of regression parameter estimates is the same as for the quasi-likelihood estimates obtained under correct specification of the variance function, thus establishing the asymptotic efficiency of the nonparametric quasi-likelihood estimates. We propose bandwidth selection strategies based on deviance and Pearson's chi-square statistic. It is demonstrated in simulations that for finite samples the proposed nonparametric quasi-likelihood method can improve upon extended quasi-likelihood or pseudo-likelihood methods where the variance function is assumed to fall into a parametric class with unknown parameters. We illustrate the proposed methods with applications to dental data and cherry tree data.
Subjects
Bandwidth selection
Deviance
Efficiency
Extended quasi-likelihood
Pseudo-likelihood
Semiparametric modeling
Smoothing
Variance function
Publisher
Institute of Mathematical Statistics
Type
journal article