Non-Life Insurance Mathematics by Erwin Straub

By Erwin Straub

The publication offers a entire assessment of contemporary non-life actuarial technological know-how. It starts off with a verbal description (i.e. with out utilizing mathematical formulae) of the most actuarial difficulties to be solved in non-life perform. Then in an intensive moment bankruptcy the entire mathematical instruments had to clear up those difficulties are handled - now in mathematical notation. the remainder of the e-book is dedicated to the precise formula of assorted difficulties and their attainable ideas. Being an outstanding mix of useful difficulties and their actuarial strategies, the booklet addresses particularly forms of readers: first of all scholars (of arithmetic, likelihood and records, informatics, economics) having a few mathematical wisdom, and secondly assurance practitioners who consider arithmetic in simple terms from a ways. necessities are simple calculus and chance theory.

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In this case we have to remember that whenever U =0 1 &=1+b irrespective ofthe distribution of Z (see section 25 on ruin probabilities), leading to a very simple but prohibitive loading 1 1+b=& An immediate practical consequence of this is that reserves cannot be ignored when assessing premiums. 3. , Var[Z] = 2A. and 1X3[Z] = 6}. so that according to the first approximation In/: -U 2E[ Y];: Var[Z] U ~=e-6U or .. i-1 or /:=e ~u·_--- 2 to be compared with the exact formula 1 _6_ /:=1+{)e- 1 +6· U • A few values of /: as a function of () and U have been calculated in Chapter 5 on retentions.

F P. j X. j j=lP .. Before attacking the problem, let us have a brief look at the history of experience rating. The theory of experience rating, called credibility theory, is in fact one of the oldest domains of non-life mathematics. It started some 80 years ago with empirical credibility formulae in the USA. Since then, primarily American, Swiss, Belgian and Scandinavian actuaries have been successfully working on this topic. From the modern statistician's point of view-at least at first sight-credibility theory is only a harmless minimum square estimation in the frame of soca lied Bayesian statistics.

O - 0 J1. =-e-~I: -e-~;=I-(I+;)e-~ for x ~ o. For the sum of n claims we find in the same manner as for the sum of interoccurrence times TI + T 2 + ... 1 that prob[ixk~xJ=I-e-~nf ~kk,. k=1 k=OJ1.. This is the well-known Gamma distribution Gn(x) with density gn(x) = --=-e dGn(x) dx 1 J1. xk _~n-I 11 1 L ~-e k = 0 J1. k. Xn - I = -J1. (n-I)(n-I)! e _~ 1 n-2 Xl L TI J1. k = 0 J1. k. e-" Gamma density (:-I)! e- x (for k = n-I) (for J1. = I) n is parameter in the Gamma distribution but argument in the Poisson distribution, whereas x (or A) is argument in the Gamma distribution and parameter in the Poisson distribution.

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