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Distributed Learning in Wireless Sensor Networks
The problem of distributed or decentralized detection and estimation in
applications such as wireless sensor networks has often been considered in the
framework of parametric models, in which strong assumptions are made about a
statistical description of nature. In certain applications, such assumptions
are warranted and systems designed from these models show promise. However, in
other scenarios, prior knowledge is at best vague and translating such
knowledge into a statistical model is undesirable. Applications such as these
pave the way for a nonparametric study of distributed detection and estimation.
In this paper, we review recent work of the authors in which some elementary
models for distributed learning are considered. These models are in the spirit
of classical work in nonparametric statistics and are applicable to wireless
sensor networks.Comment: Published in the Proceedings of the 42nd Annual Allerton Conference
on Communication, Control and Computing, University of Illinois, 200
A martingale-transform goodness-of-fit test for the form of the conditional variance
In the common nonparametric regression model the problem of testing for a
specific parametric form of the variance function is considered. Recently Dette
and Hetzler (2008) proposed a test statistic, which is based on an empirical
process of pseudo residuals. The process converges weakly to a Gaussian process
with a complicated covariance kernel depending on the data generating process.
In the present paper we consider a standardized version of this process and
propose a martingale transform to obtain asymptotically distribution free tests
for the corresponding Kolmogorov-Smirnov and Cram\'{e}r-von-Mises functionals.
The finite sample properties of the proposed tests are investigated by means of
a simulation study.Comment: 24 pages
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