CMI_2020 consultation

The CMI typically releases an updated version of the CMI Mortality Projections Model each year and we expect to release the next version, CMI_2020, by the end of March 2021. The exceptional mortality experience during the coronavirus pandemic means that a version of CMI_2020 that takes account of mortality data for 2020 in the usual way would be likely to show substantial falls in life expectancy, which we think would be in excess of what most users of the Model would consider reasonable.

We are consulting on two proposed changes to the method for CMI_2020:

  • To address the exceptional data for 2020, we propose to modify the calibration process for the Model so that users could place more or less weight on data for individual years. For the Core version of the Model, we currently propose to place no weight on data for 2020, and full weight on other years, but we will review this in light of mortality experience for the rest of 2020.
  • Unrelated to the experience of 2020, we propose to amend the age range of the dataset that we use to calibrate the Model. The intention of this change is to avoid unrealistically low initial mortality improvements at high ages, caused by limitations in how the Model copes with large historical shifts in mortality improvements that have varied significantly by age.

Working Paper 137 seeks feedback on our proposals. The deadline for responses is 1 November 2020, and we expect to publish the results of the consultation by mid-December.

We issued illustrative software to accompany the consultation, but this has been withdrawn following the publication of CMI_2020.

Updated 14 December 2020: The consultation closed on 1 November 2020, and the results of the consultation were published in Working Paper 143.



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