Small time Edgeworth-type expansions for weakly convergent nonhomogeneous Markov chains

Details Small time Edgeworth-type expansions for weakly convergent nonhomogeneous Markov chains Small time Edgeworth-type expansions for weakly convergent nonhomogeneous Markov chains

2007-05-22

arxiv.org/abs/0705.3139v1

Mathematics

Statistics Theory

58 pages

Scientific paper

We consider triangular arrays of Markov chains that converge weakly to a diffusion process. Second order Edgeworth type expansions for transition densities are proved. The paper differs from recent results in two respects. We allow nonhomogeneous diffusion limits and we treat transition densities with time lag converging to zero. Small time asymptotics are motivated by statistical applications and by resulting approximations for the joint density of diffusion values at an increasing grid of points.

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