Mortality Projections in Portugal
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Mortality Projections in Portugal 2008-2060. Edviges Coelho – Instituto Nacional de Estatística - Portugal Graça Magalhães – Instituto Nacional de Estatística - Portugal Jorge Miguel Bravo – Universidade de Évora / CEFAGE-UE João Peixoto – Universidade Técnica de Lisboa / ISEG.

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Mortality Projections in Portugal 2008-2060

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Mortality Projections in Portugal

2008-2060

Edviges Coelho – Instituto Nacional de Estatística - Portugal

Graça Magalhães – Instituto Nacional de Estatística - Portugal

Jorge Miguel Bravo – Universidade de Évora / CEFAGE-UE

João Peixoto – Universidade Técnica de Lisboa / ISEG

Joint EUROSTAT – UNECE Work Session on Demographic Projections

Lisboa, 28 - 30 April 2010


Outline

«

  • Introduction

  • Past Trends and Future Perspectives

  • Scenarios adopted

  • Projections Models:

    • The Poisson-Lee-Carter Model

    • Model extension with “Limit Life Table”

  • Empirical results

«

«


Introduction

The Portuguese Population Projections 2008- 2060:

  • Cohort - component method

  • Starting population – 1st January 2008 Estimates of Resident Population


Introduction

  • Assumptions on future levels of mortality

    • Recent trends

    • Scientific studies

    • National experts’ opinions

    • International experts’ opinions (EUROSTAT)


Mortality Projections Methodology

  • Combination of extrapolative stochastic methods with experts’ judgment

    • Poisson Lee-Carter Model

      Extrapolative method assuming that the future will mirror the past

    • Poisson Lee-Carter Model with Limit Table

      Integrates the experts’ judgment about limits to the decline of age-specific death rates into the Lee-Carter model.


Mortality Recent Trends

Life expectancy at birth Life expectancy at 65 years


The analysis of past trends and experts’ opinions provides the following perspectives for the future:

Increases in the population life expectancy will continue to occur in the future, but at a slower pace;

Declines in mortality at older ages may also be relevant;

Future gains in infant mortality are expected to be small;

Some improvement in avoidable mortality in young and adult ages, particularly associated with reduced risk of death from external causes, particularly among males (attenuation of the accident hump), can be expected;

The recent trend of narrowing the gap in longevity between men and women will continue.

Future Perspectives


Adopted Scenarios

  • Mortality Assumptions:

    • Optimistic Scenario:

      Future mortality will continue to improve at the same rate as in the recent past.

    • Moderate Scenario:

      • Integration of the experts’ perspectives on mortality for the next 50 years


Models

  • Model:

    • Optimistic Scenario:

      - Poisson Lee-Carter model.

    • Moderate Scenario:

      • Poisson Lee-Carter model with Limit Life Table.


The Lee - Carter Model

Let mx,t, be the death rate at age x in year t.

where,

average pattern of mortality by age across years,

the relative speed of change at each age of mx,t ,

is an index of the level of mortality at time t , and

an error that reflects stochastic influences which are not captured by the previous terms.

«


The Lee - Carter Model

Let mx,t, be the death rate at age x in year t.

  • This is a regression framework with no observable quantities on the RHS.

  • The model is over parameterized

  • To ensure model identification Lee and Carter (1922) add the following constraints to the parameters:

«


Fitting The Lee - Carter Model

«

  • Lee and Carter (1922) : Singular Value Decomposition

  • Brouhns, Denuit & Vermunt, 2002: Maximum Likelihood

«


PLC Estimates of


PLC Estimates ofand

Estimated Estimated


PLC Estimates of and forecasts


Lee-Carter with Limit Life Table

  • The decreasing time trend of associated with positive values of .

  • The model leads us invariably to asymptotic death rates approaching zero.

  • An unlikely scenario according to the experts’ judgment on the mortality phenomenon for the next 50 years.


Limits to the decline of age – specific deaths rates were imposed through the use of the second mortality law of Heligman and Pollard (1980).

The limits are defined accordingly to the future perspectives of mortality behaviour integrating the opinions of experts.

Lee-Carter with Limit Life Table


Lee-Carter with Limit Life Table


PLC Estimates of


PLC Estimates of


PLC Estimates of


Mortality Rates Projections 2060


Mortality Rates Projections 2060


Mortality – life expectancy

Life expectancy at birth, by sex and by mortality scenarios,

Portugal, 1980-2060


Population pyramids -1980, 2060

Fertility and net migration adopted on the central scenario of PP, moderate and optimistic scenario of mortality

The effects of the two different mortality scenarios on the projected population are particularly visible in the volume expansion at older ages… a cumulative effect is noticeable in the age pyramid of population projected for 2060 and particularly at ages above 60 years.


More detailed information on the last national exercise can be found at Statistics Portugal portal www.ine.pt:

http://www.ine.pt/xportal/xmain?xpid=INE&xpgid=ine_publicacoes&PUBLICACOESpub_boui=65944632&PUBLICACOEStema=55466&PUBLICACOESmodo=2

http://www.ine.pt/xportal/xmain?xpid=INE&xpgid=ine_estudos&ESTUDOSest_boui=65946997&ESTUDOStema=55466&ESTUDOSmodo=2


The future of Portuguese population? Hummm…

Thank you!


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