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A cohort, or generation, life table is based on, or represents, mortality experience over the entire lifetime of a cohort of persons born during a relatively short period of time, usually one year.
Cohort life tables based directly on population experience data are relatively rare, because of the need for data of consistent quality over a very long period of time.
Introduction Each year, estimates of future income and expenditures of the Old-Age, Survivors, and Disability Insurance (OASDI) program are presented to the Congress in the Annual Report of the Board of Trustees.
These estimates illustrate possible scenarios of the future financial position of the OASDI program, under present law, and thus are valuable in the policy making process for the program.
These errors, which may either offset or compound, are usually considered together as net undercount.
Postcensal estimates are made by the "inflation-deflation" method which inflates the last previous census-level population by net undercount, carries the inflated population forward according to the births and deaths tabulated in the Vital Statistics, adjusts the population by estimated net immigration, and then deflates by net undercount.
Each type of table can be constructed either based on actual population data or on expected future experience.
Such tables are useful in analyzing changes in the mortality experienced by a population through time.These projections were also used in estimating the future financial status of the Hospital Insurance (HI) and Supplementary Medical Insurance (SMI) programs as described in the 2005 Annual Report of the Medicare Board of Trustees.Mortality rates are presented in this study in the context of life tables, which are commonly used by actuaries and demographers.Cohort tables can, however, be readily produced, reflecting mortality rates from a series of period tables for past years, projections of future mortality, or a combination of the two.
Such tables are superior to period tables for the purpose of projecting a population into the future when mortality is expected to change over time, and for analyzing the generational trends in mortality.For the 2005 Trustees Report, three separate projectionsintermediate, low cost, high costwere prepared.