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Multiple Life Models

Multiple Life ModelsLecture: Weeks 9-10 Lecture: Weeks 9-10 (STT 456) Multiple Life ModelsSpring 2015 - Valdez1 / 38 Chapter summaryChapter summaryApproaches to studying Multiple life Models :define Multiple statestraditional approach (use joint random variables)Statuses:joint life statuslast-survivor statusInsurances and annuities involving Multiple livesevaluation using special mortality lawsSimple reversionary annuitiesContingent probability functionsDependent lifetime modelsChapter 9 (Dickson et al.)Lecture: Weeks 9-10 (STT 456) Multiple Life ModelsSpring 2015 - Valdez2 / 38 Approachesmultiple statesStates in a joint life and last survivor model 02x+t:y+t 13x+t 01x+t:y+t 23y+txaliveyalive(0)xaliveydead(1)xdeady alive(2)xdeadydead(3)Lecture: Weeks 9-10 (STT 456) Multiple Life ModelsSpring 2015 - Valdez3 / 38 Approachesjoint future lifetimesJoint distribution of future lifetimesConsider the case of two lives currently agesxandywith respectivefuture cumulative dist.

Consider the case of two lives currently ages xand ywith respective future lifetimes T xand T y. Joint cumulative dist. function: F ... 2 Calculate the covariance of T xand T y. 3 Evaluate the probability (x) outlives (y) ... In the case of independence, we have: x+t:y+t= t xp …

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  Independence, Covariance

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