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Mortality projections

The CMI produces a number of tools for modelling future mortality improvements, together with supporting research papers

The CMI Mortality Projections Model is a deterministic model driven by user inputs

The CMI Mortality Projections Model is a deterministic model driven by user inputs. The model is based on the assumption that current rates of mortality improvement converge to a single long-term rate. The latest version of the Model, CMI_2018, was published alongside CMI Working Paper 119 in March 2019. CMI_2018 is calibrated to England & Wales population mortality data up to 31 December 2018.

A survey is being carried out by the Mortality Projections Committee to collect the views of users of the CMI Mortality Projections Model. We are interested in how the Model is used in practice and in gathering users’ views on how we could improve the Model and our supporting research. The survey has been sent to nominated contacts at all current Subscribers with responses requested by 31 December.

All responses to the survey will be shared with the Committee. A summary of responses may be made more widely available but we will not attribute comments to particular companies or individuals.

Important note: An updated version of the CMI_2018 software, v02, was released in April 2019 to correct a potential error that could have affected users in a specific circumstance, described on the Working Paper 119 webpage.

Previous versions of the CMI Mortality Projections Model:

Monitoring England & Wales population mortality

We publish an “England & Wales population mortality update” every quarter, analysing recent mortality using provisional weekly deaths data published by the Office for National Statistics (ONS).

CMI Working Paper 111 describes the data and our method and includes the provisional first analysis, dated October 2018. 

Future updates will be available from the mortality monitor page.

CMI library of mortality projections

The CMI publishes a library of mortality projections contained in a series of spreadsheets, including sample projections from the ‘92’ series, interim cohort projections, P-Spline and Lee Carter models, the National Population Projections, and the CMI Mortality Projections Model. The latest version of the library, version 1.5, was released in August 2014.  Note: this version (and version 1.4) of the Library are available to Authorised Users only. 

The CMI is no longer updating the library.  However, given interest in the National Population Projections, we have requested details of the 2014-based projections from the ONS in the form contained in the library.  Corresponding life expectancies are here.

Previous versions:

  • Version 1.4 was released in April 2013
  • Version 1.3 was released in November 2011
  • Version 1.2 was released in June 2011
  • Version 1.1 was released in March 2009 alongside CMI Working paper 37
  • Version 1.0 was released in November 2007 alongside CMI Working paper 30. This paper also summarises the feedback on the consultation on the draft library, which was published alongside CMI Working paper 27 in July 2007.

Earlier projections

Earlier mortality projections were integrated into many CMI published mortality tables. For example the ‘92’ Series mortality projections are specified in CMI Report 17. An interim basis for adjusting these projections for cohort effects (the ‘cohort projections’) was later published in CMI Working Paper 1 in December 2002.

The CMI has researched a number of stochastic projection methodologies, culminating in CMI Working Paper 20 (focusing on P-Splines) and CMI Working Paper 25 (focusing on Lee Carter). The illustrative software used for the research is available on request.

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