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A Galton–Watson process with a threshold at 1 and an immigration at 0

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  • Lu, Dawei
  • Lv, Huangding

Abstract

In this paper we consider a special class of population-size-dependent branching processes, which can also be seen as an extension of Galton–Watson processes with state-dependent immigration (GWPSDI). The model is formulated as follows. Let Zn be the size of individuals belonging to the nth generation of a population. If Zn>1, the population evolves as a critical Galton–Watson process with finite variance; if Zn=1, the population evolves as another Galton–Watson process; if Zn=0, Zn+1 is drawn from a fixed immigration distribution. Based on the technical routes in Foster (1971) and Pakes (1971), some asymptotic results identical with those of GWPSDI are obtained by detailed computations.

Suggested Citation

  • Lu, Dawei & Lv, Huangding, 2023. "A Galton–Watson process with a threshold at 1 and an immigration at 0," Statistics & Probability Letters, Elsevier, vol. 201(C).
  • Handle: RePEc:eee:stapro:v:201:y:2023:i:c:s0167715223001050
    DOI: 10.1016/j.spl.2023.109881
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