Poisson Limits for Sequential Multivariate Multinomial Data


Дәйексөз келтіру

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Аннотация

A well known result in probability is the Poisson limit for rare independent Bernoulli trials. The asymptotic result also holds for a multinomial setting where events are dependent. An interesting data type is a survival process in which one observes many individuals over time periods. The risk set is all those available at the beginning of each time period, thus the same individual can appear in successive risk sets. Individuals exit rarely. In our motivating example these are corporations who exit a public trading system by default or merger, so there are several exit types, hence the multinomial setting. There are also covariates available at the beginning of each period. We study the numbers of exits over time. Under rare multinomial conditions we show that the exits types converge to independent Poisson laws with respect to the exit types and also with respect to time. An immediate application is the construction of one step ahead predictions which may then be tabulated or plotted, giving a convenient tool to study themodel behaviour with respect to time. Thus one can obtain one step ahead prediction intervals for the number of exits of each type, in our case bankruptcy or merger. This is a tool that is useful for large institutional investors such as pension plans.

Авторлар туралы

Taehan Bae

Mathematics and Statistics

Хат алмасуға жауапты Автор.
Email: taehan.bae@uregina.ca
Канада, Regina, Saskatchewan, S4S 0A2

Reg Kulperger

Statistical and Actuarial Sciences

Email: taehan.bae@uregina.ca
Канада, London, Ontario, N6A 3K7


© Pleiades Publishing, Ltd., 2018

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