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研究了当保费率随理赔强度的变化而变化时C ox风险模型的折现罚金函数,利用后向差分法得到了折现罚金函数所满足的积分方程,进而得到了破产概率,破产前瞬时盈余、破产时赤字的各阶矩所满足的积分方程.最后给出当理赔额服从指数分布,理赔强度为两状态的马氏过程时破产概率的拉普拉斯变换,对一些具体数值计算出了破产概率的表达式. 相似文献
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Dividend payments with a threshold strategy in the compound Poisson risk model perturbed by diffusion 总被引:2,自引:0,他引:2
In the absence of dividends, the surplus of an insurance company is modelled by a compound Poisson process perturbed by diffusion. Dividends are paid at a constant rate whenever the modified surplus is above the threshold, otherwise no dividends are paid. Two integro-differential equations for the expected discounted dividend payments prior to ruin are derived and closed-form solutions are given. Accordingly, the Gerber–Shiu expected discounted penalty function and some ruin related functionals, the probability of ultimate ruin, the time of ruin and the surplus before ruin and the deficit at ruin, are considered and their analytic expressions are given by general solution formulas. Finally the moment-generating function of the total discounted dividends until ruin is discussed. 相似文献
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In this paper we examine the joint distributions of several actuarial diagnostics which are important to insurers’ running in the classical risk model. They include the time of the surplus process leaving zero ultimately (simply, the ultimately leaving-time), the number of zero, the surplus immediately prior to ruin, the deficit at ruin, the supreme and minimum profits before ruin, the supreme profits and deficit until it leaves zero ultimately and so on. We obtain explicit expressions for their joint distributions mainly by strong Markov property of the surplus process—a technique used by Wu et al. (2002) [J. Appl. Math., in press], which is completely different from former contributions on this topic. Further, we give the exact calculating results for them when the individual claim amounts are exponentially distributed. 相似文献
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该文主要讨论带干扰古典风险模型的破产瞬间余额和破产赤字的边际及联合分布.借助于修正阶梯高度的结果,得到了它们的表达式.当索赔服从指数分布时,给出它们的精确表达. 相似文献
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我们考虑既带有随机干扰又带有确定投资回报的风险过程, 得到了破产前瞬间盈余的分布$F_{\delta}(u,x)$及破产前瞬间盈余和破产时赤字的联合分布$H_{\delta}(u,x,y)$所满足的积分表达, 连续性及二次连续可微性和积分--微分方程. 同时, 只有随机干扰的风险模型下的破产前瞬间盈余的分布及破产前瞬间盈余和破产时赤字的联合分布所满足的性质也被得到. 已有文献中的诸多有关结果均可以通过令我们结论中的某些参数特殊化为零而得到. 相似文献
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稀疏过程的三特征的联合分布函数 总被引:1,自引:0,他引:1
本文考虑一类人寿保险,保费到达为Po isson过程,索赔到达为p-稀疏过程,我们推导三特征的联合分布函数;破产时间,破产概率,破产前的盈余,破产赤字,并由这联合分布得破产概率的显示表达式. 相似文献
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In this paper, a risk model where claims arrive according to a Markovian arrival process (MAP) is considered. A generalization of the well-known Gerber-Shiu function is proposed by incorporating the maximum surplus level before ruin into the penalty function. For this wider class of penalty functions, we show that the generalized Gerber-Shiu function can be expressed in terms of the original Gerber-Shiu function (see e.g. [Gerber, Hans U., Shiu, Elias, S.W., 1998. On the time value of ruin. North American Actuarial Journal 2(1), 48-72]) and the Laplace transform of a first passage time which are both readily available. The generalized Gerber-Shiu function is also shown to be closely related to the original Gerber-Shiu function in the same MAP risk model subject to a dividend barrier strategy. The simplest case of a MAP risk model, namely the classical compound Poisson risk model, will be studied in more detail. In particular, the discounted joint density of the surplus prior to ruin, the deficit at ruin and the maximum surplus before ruin is obtained through analytic Laplace transform inversion of a specific generalized Gerber-Shiu function. Numerical illustrations are then examined. 相似文献
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Jun Cai Runhuan Feng Gordon E. Willmot 《Methodology and Computing in Applied Probability》2009,11(3):401-423
We modify the compound Poisson surplus model for an insurer by including liquid reserves and interest on the surplus. When
the surplus of an insurer is below a fixed level, the surplus is kept as liquid reserves, which do not earn interest. When
the surplus attains the level, the excess of the surplus over the level will receive interest at a constant rate. If the level
goes to infinity, the modified model is reduced to the classical compound Poisson risk model. If the level is set to zero,
the modified model becomes the compound Poisson risk model with interest. We study ruin probability and other quantities related
to ruin in the modified compound Poisson surplus model by the Gerber–Shiu function and discuss the impact of interest and
liquid reserves on the ruin probability, the deficit at ruin, and other ruin quantities. First, we derive a system of integro-differential
equations for the Gerber–Shiu function. By solving the system of equations, we obtain the general solution for the Gerber–Shiu
function. Then, we give the exact solutions for the Gerber–Shiu function when the initial surplus is equal to the liquid reserve
level or equal to zero. These solutions are the key to the exact solution for the Gerber–Shiu function in general cases. As
applications, we derive the exact solution for the zero discounted Gerber–Shiu function when claim sizes are exponentially
distributed and the exact solution for the ruin probability when claim sizes have Erlang(2) distributions. Finally, we use
numerical examples to illustrate the impact of interest and liquid reserves on the ruin probability.
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