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Adaptive estimation of the transition density of a particular hidden Markov chain
Ist Teil von
Journal of multivariate analysis, 2008-05, Vol.99 (5), p.787-814
Ort / Verlag
San Diego, CA: Elsevier Inc
Erscheinungsjahr
2008
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
We study the following model of hidden Markov chain:
Y
i
=
X
i
+
ɛ
i
,
i
=
1
,
…
,
n
+
1
with
(
X
i
)
a real-valued positive recurrent and stationary Markov chain, and
(
ɛ
i
)
1
⩽
i
⩽
n
+
1
a noise independent of the sequence
(
X
i
)
having a known distribution. We present an adaptive estimator of the transition density based on the quotient of a deconvolution estimator of the density of
X
i
and an estimator of the density of
(
X
i
,
X
i
+
1
)
. These estimators are obtained by contrast minimization and model selection. We evaluate the
L
2
risk and its rate of convergence for ordinary smooth and supersmooth noise with regard to ordinary smooth and supersmooth chains. Some examples are also detailed.