Experience Studies on Determining Life Premium Insurance Ratings: Practical Approaches
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1 Eurasia Joural of Busiess ad Ecoomics 2008, 1 (1), Eperiece Studies o etermiig Life Premium Isurace Ratigs: Practical Approaches Mirela CRISTEA* Narcis Eduard MITU** Abstract The focus of this article is to preset the modellig tehciques used o iteratioal practice i the evaluatio of right life premiums based. The kowledge ad models obtaied have a commo elemet of mortality risk idicators but these are varied i differet parts of the world. The commo elemets of these studies ad models are geerally based o a series of idicators which maily poit out their probability of survival ad they are amed the mortality idicators. These idicators represet the basis for the calculatio of the premiums quotes ad for the elaboratio by the isurers of premium tables. The beefit for the policyholder is to obtai isurace at a fair ad competitive price ad for the isurer, to maitai the eperiece of its portfolio i lie with mortality assumptios. Keywords: Isurace Premiums Quota, Actuarially Selectio Criteria, Eperiece Studies. JEL Classificatio Codes: C81, O50, G22 * Assoc. Prof. Ph (Correspodig author), Faculty of Ecoomics ad Busiess Admiistratio, Fiace epartmet, Uiversity of Craiova, ROMANIA, cmirela@yahoo.com ** Lecturer Ph, Faculty of Ecoomics ad Busiess Admiistratio, Fiace epartmet, Uiversity of Craiova, ROMANIA, arcised@yahoo.com Page 61
2 Mirela CRISTEA & Narcis Eduard MITU 1. Itroductio I order to set the right premiums for the cosumers, isurers use the eperiece studies which are based o iformatio about the past ad the future. Usually, a eperiece study refers to mortality (for life isurace) or morbidity (for health isurace) eperiece. Eperiece studies help isurers miimize ati-selectio ad focus risk selectio towards better ad more profitable risk categories. A eperiece study compares the actual eperiece o a block of busiess with a model of how the isurer aticipated that eperiece to look. This is referred to as a A/E ratio, where A stads for actual, ad E stads for epected risks (JJ lae Caroll, 2007:31). A detailed uderstadig of historical eperiece is importat i order to estimate how chages i uderwritig selectio might plausibly impact future results. By evaluatig its past eperiece, the compay ca make more cofidet decisios i the developmet of future products ad the uderwritig of its busiess. By trackig the right data elemets, isurers ca closely moitor developig eperiece drive by chages i uderwritig ad/or busiess practice. The very basic requiremets to complete ay type of mortality study iclude: policy issue date, issue age (or date of birth), geder, smoker status (depedet o the epected basis), policy face amout i force policy status (active, death, lapse, etc), termiatio date, claim settlemet amout (if differet from policy face amout), ratig iformatio about substadard risks, cause of death, ad history of uderwritig guidelies ad preferred criteria throughout the study period (published ad iteral to the isurace compay). Amog these requiremets, the most commo risk selectio factors that demostrate sufficiet credibility to form the basis of a study iclude geder, age at policy issue, smoker status, amout assured (as a idicator for socioecoomic status), ad preferred class or uderwritig ratig. The latter two categories evaluate the combiatio of all uderwritig that is performed o the group of lives. It is also importat to evaluate policy duratio sice issue. This is because risk factors ted to maifest themselves over time, resultig i a mortality curve with a selectio period that evetually grades ito ultimate mortality (ie the mortality epected at a give age i the absece of uderwritig). Evaluatio of results by Page 62 EJBE 2008, 1(1)
3 Eperiece Studies o etermiig Life Premium Isurace Ratigs: Practical Approaches. duratio ca yield iformatio about the effectiveess of the uderwritig selectio. Specific uderwritig criteria whose effects ca be studied iclude the depth ad scope of a medical or paramedical eam, The usage of these tests ca be icluded i the study by icorporatig historical uderwritig guidelies. I the Uited States, the top five medical tests used to evaluate preferred lives busiess are blood pressure, cholesterol, cholesterol ratio, build ad family history. I each case it is the actual result of the test, ad ot just the eistece of the test, that is importat. Curretly, however, few compaies store this level of historical uderwritig data electroically. 2. The factors of determiig of life premiums Whe speakig of life isurace, oe should kow that the isured perso s rights ad obligatios are geerally based o a series of idicators which maily poit out their probability of survival. These idicators are calculated by the Natioal Commissio for Statistics i each coutry ad determie the isurace premiums quota. I the Ae o. 1 are preseted mortality idicators i the Romaia. The most importat role i determiig the premium quota is played by the actuary, also amed the life isurace mathematicia. The figure 1 shows the factors accordig to which life premiums are determied: the idicators of the mortality tables; the frequecy of paymet of the premiums; the types of life isurace policies differig i terms of the covered risk (survival isurace, death isurace or mied life isurace) ad the way of payig the idemity by the isurer. From the isurer s poit of view, the life premium owed by the isured perso is desiged as the gross premium ad cosists of two elemets: the et premium ad the supplemet or the etra premium. The et premium serves to create the ecessary fud for coverig the idemities or the isurace idemities. The determiatio of the et premium takes ito accout the probability of risk occurrece ad the itesity or the frequecy of its maifestatio. The probability of risk occurrece is give by the idicators of the mortality tables determied by the age of the isured perso, i case of survival as well as i case of death. The itesity of risk maifestatio is also give by the premium level, for risks of high itesity, the premium is also high, ad for risks of low itesity, the premium is also low. If the risk has a variable maifestatio durig the cotract, the premium will be modified i proportio to its itesity. The supplemet or the etra premium covers the isurer s purchase ad maagemet EJBE 2008, 1(1) Page 63
4 Mirela CRISTEA & Narcis Eduard MITU overhead, as well as the ways of creatig beefits. The value of these costs varies i terms of differet types of isurace products ad of differet ways of dealig with them. Idicators of the mortality tables The calculatio of et premium of life isurace The frequecy of paymet of the premiums The way of payig the idemity -uique premium (itegral paymet); -aual premium (echeloed paymet). The type of isurace policy -itegral at the ed of policy (uique paymet of idemity); -echeloed: -immediate, ulimited; -immediate, limited; -delayed, ulimited; - delayed, limited. Survival Isurace Mied life isurace etermiig of gross premiums eath Isurace Net premium + Isurer epeses (salaries, geeral-admiistrative, taes) Figure 1. The factors which ifluece the determiig of life premiums Page 64 EJBE 2008, 1(1)
5 Eperiece Studies o etermiig Life Premium Isurace Ratigs: Practical Approaches Idicators of the mortality tables For a easy uderstadig of the mortality table as well as for the plaig of scietific rules i order to determie differet calculatio elemets of the premium, the mortality tables idicators are based o a iteratioal system of symbols as it follows: age of the isured persos; l() survival fuctio idicates how may persos belogig to a assumed geeratio of 100,000 livig persos are still alive whe attaiig the age of years; p() survival probability epresses the chaces of a perso attaiig the age of years to cotiue to live till the age of +1 years; q() death probability epresses the risk udertake by a perso who has already tured years, that of dyig before attaiig the age of +1 years; d() umber of persos supposed to pass away withi ad (+1) years idicates how may persos of years old passed away before the age of +1 years, beig determied by the differece betwee the umber of survivors aged years (l ) ad the umber of survivors aged +1 years (l +1 ); E() hope of life at the age of or life epectacy represets the average umber of years left to be lived for a perso survivig the age of ; Hope of life at birth also amed the spa of life idicates the average umber of years supposed to be lived by a ewbor baby. A commo measure is the differece i the life epectacy betwee male ad female. Life epectacy ca be measured from ay age, ad is ofte measured from birth, but for assessig the impact of the mortality differetial betwee males ad females is appropriate to cosider life epectacy i middle age. For eample, the researchers studies show the differece betwee life epectacy at age 45 for females ad males i the EU Member States. Female life epectacy at age 45 sigificatly eceeds that of males i all EU coutries. The differece rages from 3.4 years (i emark) to 6.5 years (i Frace). Lookig forward, i the UK Govermet's official atioal populatio projectios (produced by the Govermet Actuary's epartmet), the se differetial i life epectacy at age 50 is epected to cotiue for may years i the future. From 3.6 years i 2002, it is epected to arrow oly to 3.1 years by 2041 (Memoradum by Swiss Re, EJBE 2008, 1(1) Page 65
6 Mirela CRISTEA & Narcis Eduard MITU For the life isuraces, these idicators represet the basis for the calculatio of the et premiums ad for the elaboratio of premium tables. I order to estimate the et premiums, the actuarial sciece provides geeral formulas for the estimatio of these idicators, made up of symbols. A real determiatio of the premiums ivolves the subrogatio (commutatio) of oe formula made of symbols with the figures correspodig to the isured perso s age ad to the iterest which icrease the premium. These figures meat to achieve the commutatio of the formula are already calculated withi the mortality tables for each age ad they are called umbers of commutatio. For the actualizatio factor (discout) marked with v, the percetage used by the isurace compay i order to calculate the iterest for the premiums, is cosidered ad it accumulates i time The frequecy of paymet of the premiums For the estimatio of the premium, the paymet possibilities are take ito cosideratio. For the life isurace, the premium to be paid is cashed oce as a uique premium or echeloed premiums. The uique premium is estimated i order to cover the risk durig the whole isured period as the isurer cashes the total amout afferet to the isurace duratio at the begiig of the cotract. The cashed uique premium ad the afferet iterest resultig from its ivestmet, will be used for the paymet of the idemity. This modality of paymet is less used i practice, beig applied for log term life isuraces. Isuraces ivolvig the paymets echeloed premiums are ofte requested by the isured persos, because the amout represetig the uique premium costitutes a importat fiacial effort The way of payig the idemity ad the type of isurace policy Aother factor ifluecig the amout of the et premium is determied by the paymet possibility used for the isurace idemity ad the type of the isurace policy (survival isurace, death isurace or mied life isurace) ad it is cosidered separately for each isured risk. Thus, i practice, there are the followig situatios cosiderig the modality of payig the idemity: 1. The idemity is completely paid i a certai umber of years startig from the cotract momet of the isurace policy (the uique paymet of the idemity). Page 66 EJBE 2008, 1(1)
7 Eperiece Studies o etermiig Life Premium Isurace Ratigs: Practical Approaches. 2. The idemity is paid i istallmets as it follows: - ulimited immediate auities the isured perso pays the et premium at the coclusio of the isurace policy i order to receive the idemity i istallmets (auities), shortly after the coclusio of the cotract (immediate auities), durig his whole life period, at the begiig or at the ed of the year; - limited immediate auities - the isured perso pays the et premium at the coclusio of the isurace policy i order to receive the idemity i istallmets, shortly after the coclusio of the cotract, for a limited period of time (limited immediate auities); - ulimited delayed auities - the isured perso pays the et premium at the coclusio of the isurace policy i order to receive the idemity i istallmets (auities), after a certai period of time from the coclusio of the isurace policy (delayed auities), durig his whole life period (delayed life auities); - limited delayed auities - the isurer pays the idemity i a certai umber of years from the coclusio of the isurace policy (delayed auities), but for a limited period of time (limited). The death isurace relies o the premise that the isurer will pay the beeficiary of the isurace a certai amout of moey at the date of death of the isured perso. The determiatio of the uique et premium, i the case of death isuraces, takes ito cosideratio the cotractual duratio of the isurace which may be: udetermied (for life), a period of several years or a short period of time. I practice, the life isurace policy reflects more ofte a mied ature, thus, it covers the survival risk, as well as the death risk. Therefore, the isurer will pay the idemity to the isured perso, at the termiatio of the cotract if the last oe is alive, or the sum will be paid to the successors, at the date of death of the isured perso. So, the uique et premium owed by the isured perso is calculated by summig up the et shares of the premiums afferet to the two isured risks. 3. The et ad gross premiums for all types of life isuraces As we metioed before, the et premium differs i accordace with the type o isurace policy, the isurace period ad way of idemity paymet by the isurers. I the Table 1, we sythesize the formulas for determiig the uitary (at 1 c.u. idemity) uique (itegral paymet of premium by the isured perso) et premium for the three basic life isurace types. EJBE 2008, 1(1) Page 67
8 Mirela CRISTEA & Narcis Eduard MITU Table 1: The uitary uique et premium for survival, death ad mied life isuraces The paymet of idemity The uique paymet of the idemity Ulimited immediate auities Limited immediate auities Ulimited delayed auities Limited delayed auities Survival Isurace The uitary uique et premium E a / / a a r / a N + N N + N N + r + N + r+ Isurace period eath isurace oe year term Udetermie d term Limited immediate isurace Ulimited delayed isurace Limited delayed isurace eath Isurace The uitary uique et premium d A l M A / / r / A A A M M M M + + r + M + r+ Mied Life Isurace Isurace period The uitary uique et premium The uique paymet of the idemity i + M M + case of survival risk ad limited / AM + immediate valability for death risk Notatios used i the table have the followig meaig: E idicates the uitary uique et premium (the idemity for a currecy uit), due to be paid by the isured perso aged i order to receive the sum of 1 currecy uit (c.u.) at the date of attaiig the age of (+); Page 68 EJBE 2008, 1(1)
9 Eperiece Studies o etermiig Life Premium Isurace Ratigs: Practical Approaches. a uitary uique et premium paid by the isured perso aged for the isurace which provides him 1 c.u. durig his whole life as idemity. It results from reportig the total umber of survivors aged over years (N ) to the umber of livig persos attaiig the age of years ( ); a / uitary uique et premium paid by the isured perso aged for the isurace which provides him 1 c.u. i the et years as idemity. The differece from the umerator idicates the total umber of survivors withi the period of ad + years. a / uitary uique et premium paid by the isured perso aged for the isurace which provides him (if he is alive) 1 c.u. as idemity, i years, durig his whole life; a r / uitary uique et premium paid by the isured perso aged for the isurace which provides him (if he is alive) 1 c.u. as idemity, i r years for years; / uitary uique et premium of the mied isurace for a period of years, by meas of which the isurer pays the sum of 1 c.u. if the isured perso is still alive i years or the sum of 1 c.u. at the date of his death if it occurred before the momet ; AM, N ad M are commutatio umbers. Number of commutatio discout factor ( v l, where: v life actualizatio factor or life v 1, i idicates the actualizatio rate); age of the isured 1 + i perso; duratio of the isurace policy. Number of commutatio N ω k k ad it idicates the total umber of the survivors after attaiig the age of years, for which the cashed premiums are capitalized usig a actualizatio factor last survivor. v. ω idicates the age of death of the EJBE 2008, 1(1) Page 69
10 Mirela CRISTEA & Narcis Eduard MITU Number of commutatio M ω Ck k, where C d v. M epresses the total umber of persos who will die after attaiig the age of years, cosiderig a factor of capitalizatio v. The values of, N ad M for each age become costat ad they are listed i the tables of commutatio umbers, elaborated cosiderig the mortality table ad the values assumed by the rate of actualizatio v (see Ae 2.). For a idemity, S, the total uique et premium (P) is obtaied by multiplyig the uitary uique et premium specific to each type of isurace by S value. Most frequetly i practice, the isured perso chooses the premium paymet i aual, semestrial, quarterly or mothly istallmets. The aual et premium is determied by reportig the uique et premium to the auity specific to the premium paymet modality. Cosiderig r years the duratio of the premium paymet, the auity specific to the paymet modality (a limited immediate auity is cosidered), is give by the relatio: a ( A) N N + r / r. For eample, for survival isurace with uique paymet of the idemity, aual et premium (p ) is give by: p + +. N N + r N N + r Page 70 EJBE 2008, 1(1)
11 Eperiece Studies o etermiig Life Premium Isurace Ratigs: Practical Approaches. 4. Case studies cocerig premium fees for differet types of isurace policies 4.1. Survival Isurace Oe family made up of two persos aged 30, respectively 40 coclude a survival isuraces for a period of 10 years ad a isurace idemity of 10,000 c.u., each oe completely payable at the coclusio of the cotract, if the isured persos are alive. The et premium is itegrally paid at the coclusio of the isurace ad the iterest used by the isurer is of 30%. Referrig to the estimatio report the uitary uique et premium specific to the survival isurace, for a uique paymet of the isurace idemity (Table o. 1) it results a total uique et premium, for the isured perso aged 30, usig the commutatio umbers for 30%, which is determied as it follows: P , S 10 E30 S S c.u So, for the isured perso aged 30, i order to receive after 10 years the idemity of 10,000 c.u., he has to pay as et premium, i the momet of cotract policy c.u. If isured perso is older, of 40 years, total et premium becomes: P , S 10 E40 S c.u We otice that, for a older age, et premium isurace is decreasig, because the isured perso is older, the probability as isured perso to be alive at the ed of policy is reduced. We presume that the isured perso of 30 years chooses for the paymet of et premium durig o period of 5 years. Thus, aual et premium becomes: P S 10,000 10,000 N N N N r c. u. So, for the isured perso aged 30, i order to receive after 10 years the idemity of 10,000 c.u., he has to pay as aual et premium, of 222 c.u., time of 5 years. Thus, he pays a total et premium of 1,110 c.u. (222 c.u. 5 years), cofroted by c.u, i the case o itegral paymet of premium. EJBE 2008, 1(1) Page 71
12 Mirela CRISTEA & Narcis Eduard MITU 4.2. eath Isurace The mai issue discussed at the coclusio of the death isurace policy cosists i the determiatio of the eed for isurace. There is o eed for this type of isurace whe cosiderig persos with small debts, who gai importat reveues from ivestmets or persos who do ot deped o the isured perso s icome. Oe perso, metioed as the cotractor, wishes to coclude a death isurace for his so, aged 35, metioed as the isured perso, for a isured amout of 10,000 c.u., for a period of 12 years. I Romaia, the miimum age for cocludig a isurace policy is 16 years ad the maimum age is 55 ai. At the coclusio of the isurace policy, aother importat factor is that the isured persos must ot pass by the age of 67 years at the termiatio of the cotract. The duratio of the cotract is optioally determied by the isured perso or by the isurace cotractor ad it may vary from 12, 15, 20, 25 to 30 years. The idemity is determied by the isured perso havig the isurer s agreemet ad i accordace to the terms imposed by the isurace compay. Persoal data belogig to cotractig party of the policy as well as to the isured party are provided i the isurace applicatio. The cotract stipulates several questios cocerig the health coditio of the isured persos, such as: whether he is eposed to serious risks i practicig his professio or apart from his work, whether he has suffered from a certai disease - Lug troubles, heart diseases, stomach complaits, pacreas, itestie, kidey or geital disorders, europsychical disorders, epilepsy, diabetes, arterial hypertesio, tuberculosis, cacer or ay other form of tumour, blood diseases, articular, osseous or ski diseases - or a surgical itervetio, whether he was retired due to differet health matters, if there were other life isurace petitios addressed to other isurace compaies i the past ad, moreover, if they were rejected or if there were pealties applied, questios regardig the medicatio frequecy, drug ad alcohol cosumptio, the eistig of other life isurace policies. It is also metioed here the medical service ad the family doctor. Whe the isured perso dies, his wife becomes the beeficiary of the isurace idemity. The premium is completely paid at the date of cocludig the isurace policy ad it is determied accordig to the tables of commutatio umbers for a average iterest of 20% (see Ae 2). Page 72 EJBE 2008, 1(1)
13 Eperiece Studies o etermiig Life Premium Isurace Ratigs: Practical Approaches. ealig with a death isurace with a limited validity, the et premium is determied accordig to the table of commutatio umbers, cosiderig the followig the estimatio report (see Table 1): P S / A M S M + Kowig S 10,000 c.u., 12 years ad 35 years, we obtai: M M P 10, , c. u All cotributios correspodig to the costs made by the isurace compay are added to the value of the uique et premium, obtaiig thus the gross premium. Cosiderig these costs totalizig 80 c.u., the uique gross premium achieves the value of 294 c.u. Eve though, the isurace policy is haded to the isured perso, the obligatio of payig the premiums rests upo the cotractor Mied Life Isurace A isured perso aged 40 wishes to coclude a mied life isurace o a period of 10 years, so that, at the age of 50 he may be retured a idemity meat to provide him a certai stadard of livig. The isured perso decides to pay maimum 1,000 c.u. aually, cosiderig the value of the idemity determied for both case, accordig to the table of commutatio umbers: uique ad aual paymet of the premium, for a period of 5 years. I order to determie the idemity, oe should take ito accout the estimatio report betwee the aual et premium ad the umbers of commutatio from the table of commutatio umbers, which correspods to the age of 40 ad for a aual iterest of 20%. p S + + M N N M + r + p S + ( N + M N + r M ) + 1,000( N + M N 45) 40 M From umber of commutatio table for the 20% discout rate (see Ae 2), there are selected the values of umber of commutatio, thus: N , N , , M ad M Replacig i formula, we obtai: 50 EJBE 2008, 1(1) Page 73
14 Mirela CRISTEA & Narcis Eduard MITU 1,000( ) 1, S 19,930c. u The isured perso has the possibility of a uique paymet of premium, determied as follows: P S 50 + M M ,930 3,554c.u If isured perso will choose for itegral paymet of premium i the momet of cotractig the policy, he will pay 3,554 c.u. for a idemity of 19,930 c.u., ad if he will choose for echeloed paymets, he will pay, for the period of 5 years a total amout by 5,000 c.u. The supplemet or the etra premium which represets isurer s epeses will be added at the et premium value ad it will be obtaied the gross premium (total premium). 5. Modelig techiques for premium ratigs The isurace idustry has developed some models for a accurate calculatio of premium ratigs. The most ackowledged models are two types of them (Chessma Wekwete, 2007: 43): multivariable models, most importat beig the Co model; geeralized liear models. I the absece of the previous eperiece of the risks (statistical data), eedful to trasform these ito premium ratigs, there is used other tools, kow as multiple state models, Markov model beig oe sigificat. The Co model is a multivariable model used to aalyze the effect of differet risk factors o the time to a evet (Chessma Wekwete, 2007:45). The risk factors (amed covariates) used by Co model are age, cholesterol level as cotiuous variables or geder ad smoker status, as categorical variables. Various statistical software packages are available to calculate relative risks usig differet data which ca produce a output that icludes the estimates of the relative risks ad their stadard errors. Geeralised liear models GLMs allow for the aalysis ot oly of survival times, but also other risk classificatio measures such as hazard rates, isurace claims eacted over a specified duratio, ad proportios of diseased lives i a specified group of lives. Page 74 EJBE 2008, 1(1)
15 Eperiece Studies o etermiig Life Premium Isurace Ratigs: Practical Approaches. A sigificat costrait for Co model ad GLMs is that oly risk factors for which values are available for all observatios ca be icluded i the model. Markov models are defied by the specified states of isured lives ad the hazard rates betwee the states. The Markov property is that the hazard rate comig out of ay state should deped oly o the iformatio that defies the state ad ot o the history of the life prior to eterig state. May-sided of Markov models is proved by the fact that premiums ca be calculated easily for ay life isurace policy, o the coditio that certai grouds are met: the states must be defied; all the hazard rates betwee the states must be defied, ad must meet the Markov property criteria; the isurace paymets related to these states ad ay other required iformatio, such us iflatio values or iterest rates, must be provided. 6. Coclusio Practical eperiece of the aroud the world life isurers demostrates that, they have to quatify ad group similar risks together, based o actuarially selectio criteria. This criteria may ot produce equal prices betwee isured persos, but it is equitable ad guaratees that the cosumer pays fair ad competitive premiums based o the risk everyoe brigs to the group. Uderwritig eables isurers to group together those with the same level of epected risk ad to charge them the same premium for the protectio they choose. The beefit for the policyholder is to obtai isurace at a fair ad competitive price. For the isurer, the beefit is to maitai the eperiece of its portfolio i lie with mortality assumptios. The key fidig of researchers aalysis is that, i all developed coutries i the world, males have higher overall rates of mortality tha females, eve after allowig for other factors icludig whether or ot a perso smokes, their age ad marital status, where they live ad their lifestyle i geeral. Moreover, ot oly does female life epectacy eceed that of males today, but this has bee the case i these coutries for may years. By workig with a diverse group of professioals such as statisticias, actuaries, doctors, uderwriters, geeticists ad other research professioals, it is possible to take a holistic approach to reviewig eperiece studies. The accumulated kowledge gaied as pricig ad uderwritig eviromets chage over time, i differet parts of the world, ca be employed to help isurers miimize atiselectio ad focus risk selectio towards better ad more profitable risk categories. This ultimately leads to fairer ad more competitive, ad therefore more affordable, premiums for the ed cosumer. EJBE 2008, 1(1) Page 75
16 Mirela CRISTEA & Narcis Eduard MITU Refereces Bowerma, Walter, G. (1950) Auity Mortality. Trasactios of the Society of Actuaries 2: Carroll, JJ. L. (2007) Evaluatig risk with eperiece study aalysis. Publicatio Swiss Re, The Life risk selectio at a fair price: reiforcig the actuarial basis: Co, I Graham, (1987) Why o Wome Live Loger ad Is It Worth It?, British Medical Joural, 294: Cristea, M., racea, R. & Mitu, N.E. (2007) Life Isurace ad Pesio Fuds, Craiova, Uiversitaria Publishig House. Cristea, M. & Criveau, R. (2007) Possibilities to iversify Life Isurace i Romaia, Joural of Admiistrative Scieces (JAS), 2007, Vol. 5, o. 1: emographic Yearbook Historical Supplemet ( ), Uited Natios Publicatios. evis, T. (1990) The epectatio of life i Eglad ad Wales. Populatio Treds 60, Yeatma, J. (1998) Mauel iteratioal de l assurace, Paris, Ecoomic Publishig House Madiga, C. (1957) Are Se Mortality ifferetials Biologically Caused?, Millbak Memorial Fud Quarterly 35(2): Nabholz, C. (2007) The private isurace pricig ad risk selectio process, Publicatio Swiss Re, The Life risk selectio at a fair price: reiforcig the actuarial basis: Office for Natioal Statistics, ONS. (2002) Mortality statistics: geeral 2000 series H1 o 33. ONS. (2006) Mortality statistics: cause 2005 series H2 o 32. ONS. (2005) Mortality Statistics: Geeral (Eglad ad Wales) Aual review of the Registrar Geeral o deaths i Eglad ad Wales, H 1 No 38. Pikham, C.A., Cummig, M.E. & Miuk, H. (2006) The metabolic sydrome ad all-cause mortality i a isured lives populatio. North America Actuarial Joural, Vol 10, No 3. Ramey, Estelle R. (2001) How Female ad Male Biology iffer, Wome's Health Research: A Medical ad Policy Primer, ed. Florece P Haseltie. Washigto, C: Health Press Iteratioal. Uited Kigdom Parliamet. Memoradum by Swiss Re, Wekwete, C. (2007) Multivariable ad multiple state modellig. Publicatio Swiss Re, The Life risk selectio at a fair price: reiforcig the actuarial basis: Wigard,.L. (1982) The Se ifferetial i Mortality Rates. emographic ad Behavioural Factors, America Joural of Epidemiology: 115, Woolough, K. & ickeso, T. (2004) The se moratlity differetial, Swiss Re. Page 76 EJBE 2008, 1(1)
17 Eperiece Studies o etermiig Life Premium Isurace Ratigs: Practical Approaches. ANNEX 1 Populatio Mortality Tabel from Romaia both sees - period Age (years) Survival fuctio l Number of deceased people d() eath probability q() Survival probability p() Average umber of survivals from to +1 years lm() Life epectacy E() , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,11 EJBE 2008, 1(1) Page 77
18 Mirela CRISTEA & Narcis Eduard MITU Age (years) Survival fuctio l Number of deceased people d() eath probability q() Survival probability p() Average umber of survivals from to +1 years lm() Life epectacy E() , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,69 Page 78 EJBE 2008, 1(1)
19 Eperiece Studies o etermiig Life Premium Isurace Ratigs: Practical Approaches. Age (years) Survival fuctio l Number of deceased people d() eath probability q() Survival probability p() Average umber of survivals from to +1 years lm() Life epectacy E() , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,24 EJBE 2008, 1(1) Page 79
20 Mirela CRISTEA & Narcis Eduard MITU Age (year) ANNEX 2 Commutatio Numbers Table, for a discout rate of 20% - Case of Romaia - Survival Fuctio l v ( 1+ i) l v ω v + 1 ω N C k M Ck ( k l l+ 1) k , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,87736 Page 80 EJBE 2008, 1(1)
21 Age (year) Eperiece Studies o etermiig Life Premium Isurace Ratigs: Practical Approaches. Survival Fuctio l v ( 1+ i) v l ω v + 1 ω N C k ( l l k + 1 ) M Ck k , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,00917 EJBE 2008, 1(1) Page 81
22 Mirela CRISTEA & Narcis Eduard MITU Age (year) Survival Fuctio l v ( 1+ i) v l ω v + 1 ω N C k ( l l k + 1 ) M Ck k , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,00000 Page 82 EJBE 2008, 1(1)
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