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PubMed1984

[Variations on the theme of logistic function].

"The use of the logistic function in demographic techniques and analyses has increased significantly during recent years. Nevertheless, not too much attention has been given to the function of the constants nor to the consequences of the implicit assumptions when the function is used for estimating some demographic parameters. In this article, the author underlines the meaning of the constants in the logistic function when applied in some demographic cases, and gives some examples of the assumptions involved in the application of the logistic to the trends of urban/rural populations, life expectancies, and the logit transformation." (summary in ENG)

Demography↗
PubMed1982

Demographic aging in the United States: implications for population and income redistribution to the year 2000.

"The purpose of this paper is to analyze the effects of a prolonged period of sustained low fertility upon shifts in the population distribution of the United States among Department of Energy (DOE) regions." The authors also examine the impact of demographic aging on income distribution up to the year 2000 using the assumptions made in the Series III population projections prepared by the U.S. Bureau of the Census in 1977. It is noted that migration will emerge as the primary agent for internal population redistribution.

Age Distribution↗
PubMedDate not supplied

Estimation of expectation of life at advanced ages.

Comments are presented on a formula developed by Enzo Lombardo "for the relation between the death rate above age a and the growth rate above age a (where a is an advanced age, above 55 or 60) on the one hand, and the expectation of life at age a on the other." Estimates obtained by this method are compared with results obtained by the method of S. Horiuchi and A. J. Coale. It is concluded that "the formula proposed by Horiuchi and [Coale] produces much more accurate estimates, with a maximum error of 0.03 years." The author describes a way in which Lombardo's method "can be modified to give estimates of precision comparable to the Horiuchi and Coale estimates." (summary in FRE, ITA)

Adult↗