A simple model for linking life tables by survival-mortality ratios | Zendy

S. Mitra | Zendy

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A simple model for linking life tables by survival-mortality ratios

Author(s) -

S. Mitra

Publication year - 1983

Publication title -

demography

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.099

H-Index - 129

eISSN - 1533-7790

pISSN - 0070-3370

DOI - 10.2307/2061237

Subject(s) - survivorship curve , statistics , table (database) , mathematics , life table , demography , logit , econometrics , population , computer science , sociology , data mining

Patterns of variation in mortality can be studied by measuring changes in selected life table functions. A model is proposed in which the rate of change over time in the life table survivorship probability at any age has been assumed as proportional to the product of its own value and its complementary probability or the probability of dying by that age, where the proportion is the same for all ages and depends only on the time duration between successive life tables. The end result is that the logit functions of the survivorship probabilities at two points in time are linearly related with a slope of one. The projecting power of the model has been tested by using U.S. life tables for the years 1950 and 1970 as well as Coale and Demeny's regional model life tables. In the latter case, the model produced surprisingly close matches even when the expectations of life differed by as much as 20 years.

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