Session 6A, Mortality Improvement Approaches. Moderator: Jean Marc Fix, FSA, MAAA. Presenters: Laurence Pinzur, FSA
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1 Session 6A, Mortality Improvement Approaches Moderator: Jean Marc Fix, FSA, MAAA Presenters: Laurence Pinzur, FSA
2 Session 6A Mortality Improvement Models 6 January 2017 Laurence Pinzur, PhD, FSA Aon Hewitt
3 Agenda The Challenge Some Basics Deterministic Models used in the US Deterministic Models used in the UK and Canada Assessing Model Effectiveness Questions LT100 January
4 The Challenge Prediction is very difficult, especially about the future. Niels Bohr
5 The Challenge = 1.0% = 1.6% Source: SOA; Mortality Improvement Scale MP 2016 Report LT100 January
6 The Challenge LT100 January
7 The Challenge: Signal vs Noise LT100 January
8 Some Basics
9 Stochastic vs Deterministic Both start with historical mortality experience, but Stochastic mortality improvement (MI) models reflect assumed probability distributions, which permit future volatility to be quantified; some examples: Lee Carter Cairns Blake Dowd (CBD family of models) Deterministic models produce a single answer (based on a given set of inputs); some examples: CMI RPEC LT100 January
10 Age Only vs Two Dimensional Age only projection scales consist of (genderspecific) MI rates that do not vary over time Example: Scale AA Let q(x,y) represent the mortality rate at age x in calendar year y Then q(x,2016+t) = q(x,2016) (1 AA x ) t Two dimensional projection scales consist of (gender specific) MI rates that are functions of both age and calendar year Example: Scale MP 2016 Let f(x, y) represent the MP 2016 rate at age x in calendar year y Then q(x,2018) = q(x,2016) (1 f(x,2017)) (1 f(x,2018)) LT100 January
11 Static vs Generational Mortality Calendar Year Static Age q(60,2016) q(60,2017) q(60,2018) q(60,2019) q(60,2020) q(60,2021) q(60,2022) q(60,2023) q(60,2024) q(60,2025) 61 q(61,2016) q(61,2017) q(61,2018) q(61,2019) q(61,2020) q(61,2021) q(61,2022) q(61,2023) q(61,2024) q(61,2025) 62 q(62,2016) q(62,2017) q(62,2018) q(62,2019) q(62,2020) q(62,2021) q(62,2022) q(62,2023) q(62,2024) q(62,2025) 63 q(63,2016) q(63,2017) q(63,2018) q(63,2019) q(63,2020) q(63,2021) q(63,2022) q(63,2023) q(63,2024) q(63,2025) 64 q(64,2016) q(64,2017) q(64,2018) q(64,2019) q(64,2020) q(64,2021) q(64,2022) q(64,2023) q(64,2024) q(64,2025) 65 q(65,2016) q(65,2017) q(65,2018) q(65,2019) q(65,2020) q(65,2021) q(65,2022) q(65,2023) q(65,2024) q(65,2025) 66 q(66,2016) q(66,2017) q(66,2018) q(66,2019) q(66,2020) q(66,2021) q(66,2022) q(66,2023) q(66,2024) q(66,2025) 67 q(67,2016) q(67,2017) q(67,2018) q(67,2019) q(67,2020) q(67,2021) q(67,2022) q(67,2023) q(67,2024) q(67,2025) 68 q(68,2016) q(68,2017) q(68,2018) q(68,2019) q(68,2020) q(68,2021) q(68,2022) q(68,2023) q(68,2024) q(68,2025) 69 q(69,2016) q(69,2017) q(69,2018) q(69,2019) q(69,2020) q(69,2021) q(69,2022) q(69,2023) q(69,2024) q(69,2025) 70 q(70,2016) q(70,2017) q(70,2018) q(70,2019) q(70,2020) q(70,2021) q(70,2022) q(70,2023) q(70,2024) q(70,2025) 71 q(71,2016) q(71,2017) q(71,2018) q(71,2019) q(71,2020) q(71,2021) q(71,2022) q(71,2023) q(71,2024) q(71,2025) 72 q(72,2016) q(72,2017) q(72,2018) q(72,2019) q(72,2020) q(72,2021) q(72,2022) q(72,2023) q(72,2024) q(72,2025) 73 q(73,2016) q(73,2017) q(73,2018) q(73,2019) q(73,2020) q(73,2021) q(73,2022) q(73,2023) q(73,2024) q(73,2025) 74 q(74,2016) q(74,2017) q(74,2018) q(74,2019) q(74,2020) q(74,2021) q(74,2022) q(74,2023) q(74,2024) q(74,2025) 75 q(75,2016) q(75,2017) q(75,2018) q(75,2019) q(75,2020) q(75,2021) q(75,2022) q(75,2023) q(75,2024) q(75,2025) LT100 January
12 Deterministic Models Used in the US «Tout ce qui est simple est faux, mais tout ce qui ne l'est pas est inutilisable.» Paul Valéry (Everything simple is false, but everything complex is unusable.)
13 SOA MI Scales Life insurance products: Scale used in conjunction with AG 38 and VM 20 (Scale AG38 MI *) Individual annuity products: Scale G2 Statutory group annuity reserves: Scale AA Measuring retirement plan obligations: 1994 through 2011: Scale AA 2012 and 2013: Scale BB Post 2013: 2D RPEC models (MP 2014, MP 2015, and MP 2016) All age only scales * No official name given to this mortality improvement scale. LT100 January
14 AG38 MI (Life Insurance) LT100 January
15 G2 (Individual Annuity) LT100 January
16 AA (Group Annuity Reserves) LT100 January
17 Explanation for AA s Shape LT100 January
18 BB (Retirement Plan Obligations) LT100 January
19 Development of Scale BB Derived from 2D array of smoothed/projected MI rates BB 2D (Males) RPEC backed into Scale BB from a table of deferred toage 62 annuity values (RP 2000; i= 6%) LT100 January
20 Comparison (Males) LT100 January
21 Comparison (Females) LT100 January
22 2D MI Scales (US): RPEC_2014 RPEC_2014 Model Basis for MP 2014, MP 2015, and MP 2016 Conceptual framework based on CMI s (current) model Near term MI rates should reflect recent experience Long term MI rates (LTRs) should be based on expert opinion Near term rates should blend smoothly into long term rates In contrast to the CMI model, RPEC_2014 does not develop explicit A/P/C components Projection along 45 diagonals is meant to simulate cohort effects Smooth blending (from near term to long term) accomplished via horizontal and diagonal cubic splines LT100 January
23 Heatmap: Scale MP 2016 LT100 January
24 2D MI Scales (US): SSA SSA Model Future mortality improvement is one of many demographic assumptions needed to assess the ongoing financial status of Social Security, Medicare and Medicaid Three sets of alternative assumptions (low, medium, and high cost) Long term rates of MI Based primarily on in depth cause of death analysis Reflect different LTRs for different age ranges ( age gradient ) Interpolation methodology For each gender and age, the starting point of SSA projections is the average MI over the most prior 10 years Purely horizontal; no explicit recognition of cohort effects Quick transition away from near term rates (towards long term) LT100 January
25 Heatmap: SSA MI Scale LT100 January
26 Summary of US MI Scales Scale Type Latest Basis Update AG38 MI Age only 2016 SSA actual ( ) + SSA (Alt. II) assumed MI ( ) G2 Age only 2011 SSA actual ( ) + SSA (Alt. II) assumed MI through a bit extra AA Age only 1994 SSA & CSRS; retrospective only ( ) BB Age only 2012 (Scale BB 2D): SSA; assumed LTR = 1.0%¹ MP D 2016 SSA; assumed LTR = 1.0%¹ SSA (Alt. II) 2D 2016 Age dependent assumed LTR² based on cause of death projections ¹ MP 2016 LTR equals 1.0% for all ages up to 85; then tapers to 0% by age 115. ² Average LTRs in 2016 Trustees Report are 0.90% for ages 15 49, 1.07% for ages 50 64, 0.74% for ages 65 84, and 0.49% for ages 85+. LT100 January
27 Deterministic Models Used in the UK and Canada
28 Current CMI Graduated Historical MI Age Period Cohort Residual LT100 January
29 Current CMI Convergence Periods (CP) Vary In Current CMI Methodology A P A/P 100% of LTR C C Zero LT100 January
30 Current CMI Historical MI Interpolation LTR Attained A/P 100% of LTR + C Zero + Residuals LT100 January
31 CMI_2015 Example Mortality improvements from CMI_2015_M [1.5%] Source: The Future of the CMI Mortality Projections Model (October 2015) LT100 January
32 Canadian Pensioners Mortality (CPM) Long term MI rates equal to C/QPP assumption for 2030 and beyond Flat 0.8% through age 82 Gradual decline to 0% at age 115 Gender /age specific MI rates that decrease linearly (to the respective LTR) between 2012 and 2030 No explicit recognition of cohort effects Subcommittee acknowledged that a cohort effect could be observed for Canadian males, but that the impact on most pension valuations would be negligible Source: Final Report: Canadian Pensioners Mortality (February 2014) LT100 January
33 CPM B (MI Scale) Males LT100 January
34 Assessing Model Effectiveness Essentially, all models are wrong, but some are useful. George Box
35 Desirable MI Model Features Features to consider Stability Historical Fit Backtesting Forecast Accuracy (Predictive Power) Smoothness Parsimony Simplicity Relative important of the features should depend on the specific actuarial application Increasing the score of one feature often reduces the score of other features LT100 January
36 Stability vs Fit Model stability (with respect to adding new years of data) and goodness of fit to historical MI rates tend to be inversely related This is especially true when the model s interpolation methodology reflects a direction of travel Signal vs noise: What is the appropriate amount of historical smoothing? LT100 January
37 Stability vs Fit: Historical Smoothing LT100 January
38 Long Term Rate (LTR) How long is long term? SSA: 25 years MP 2016: 20 years CMI Core : 20 years (cohort component 40) CPM B: 20 years Even once a time frame has been established, determining an appropriate LTR can be problematic How much reliance should be placed on historical trends? Cause of death analysis (projected into the future) Expert opinion Unknown unknowns LT100 January
39 Forecast Accuracy The ability to accurately predict future mortality rates should clearly be a desirable feature of any MI model But the forecast accuracy (or predictive power ) of a given model is turning our to be difficult to assess (!) CMI Working Paper #91 provides some reasons why this seems to be so challenging Inherent volatility of MI, along with no requirement that future drivers of MI must behave the same way as past drivers Interaction with the model s assumed long term rate of MI Data limitations (with respect to backtesting) LT100 January
40 Inherent Volatility For a specific fixed age, let m(t) represent the central mortality rate for that age at time t Let s assume: log m(t) = S(t) + Z(t), where S(t) is some smooth, slowly varying, deterministic underlying trend and Z(t) is a standard normal random variable Variance for log m(t), Mortality Improvement (MI) and Direction of Travel (DoT) (log ( )) = 2 ( ( )) = ( Δ log ( )) = (Δ log ( )) = 2 2 ( ( )) = ( Δ 2 log ( )) = (Δ 2 log ( )) = 6 2 Source: CMI Working Paper #91; Section 5.3 LT100 January
41 Questions 40
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