Power estimates for ruin probabilities
Power estimates for ruin probabilities
复制标题
破产概率的功效估计
DOI:
10.1239/aap/1127483744
复制
发表时间:
2005
影响因子:
1.2
通讯作者:
H. Nyrhinen
中科院分区:
文献类型:
--
作者:
H. Nyrhinen
Let X 1, X 2,… be real-valued random variables. For u>0, define the time of ruin T = T(u) by T = inf{n: X 1+⋯+X n >u} or T=∞ if X 1+⋯+X n ≤u for every n = 1,2,…. We are interested in the ruin probabilities of general processes {X n } for large u. In the presence of heavy tails, one often finds power estimates. Our objective is to specify the associated powers and provide the crude estimate P(T≤xu)≈u −R(x) for large u, for a given x∈ℝ. The rate R(x) will be described by means of tails of partial sums and maxima of {X n }. We also extend our results to the case of the infinite time horizon.