A note on asymptotic behavior of critical Galton–Watson processes with immigration

نویسندگان

چکیده

In this somewhat didactic note we give a detailed alternative proof of the known result due to Wei and Winnicki (1989) which states that under second order moment assumptions on offspring immigration distributions sequence appropriately scaled random step functions formed from critical Galton-Watson process with (starting not necessarily zero) converges weakly towards squared Bessel process. The is based infinitesimal generators, while use limit theorems for processes diffusion Ispany Pap (2010). This technique was already used in (2008), where he proved functional some normalized nearly starting zero, means tend its value 1. As special case Theorem 2.1 (2008) one can get back zero initial value. present handle non-zero values further, simplify arguments as well.

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ژورنال

عنوان ژورنال: Involve

سال: 2021

ISSN: ['1944-4184', '1944-4176']

DOI: https://doi.org/10.2140/involve.2021.14.871