A Cramér–Wold device for infinite divisibility of Zd-valued distributions
A Cramér–Wold device for infinite divisibility of Zd-valued distributions
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DOI:
10.3150/21-bej1386
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发表时间:
2022-05
期刊:
影响因子:
1.5
通讯作者:
David Berger;Alexandra H Lindner
中科院分区:
文献类型:
--
作者:
David Berger;Alexandra H Lindner
We show that a Cramér–Wold device holds for infinite divisibility of Zd-valued distributions, i.e. that the distribution of a Zd-valued random vector X is infinitely divisible if and only if the distribution of aTX is infinitely divisible for all a ∈ Rd, and that this in turn is equivalent to infinite divisibility of the distribution of aTX for all a ∈ N0. A key tool for proving this is a Lévy–Khintchine type representation with a signed Lévy measure for the characteristic function of a Zd-valued distribution, provided the characteristic function is zero-free.