age distribution


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age distribution

[′āj dis·trə′byü·shən]
(ecology)
The distribution of different age groups in a population.
References in periodicals archive ?
No significant differences in age distributions were observed year to year data not shown).
To correct for the substantial international migration of males in the intercensal period 1972-1981, I make a crude estimate of the age distribution of emigration using Rogers and Castro's 11-parameter model (1981); using this and the estimates of the volume of migration in the period, I adjust the age-specific growth rates of males.
The age-adjusted rates are, of course, exactly the same as they were in the year 2000, because of the assumption that the age-specific participation rates do not change and because the 1960 age distribution of the population is being used as a constant reference.
Monthly length distributions (5-cm length groups) and corresponding (observed) age distributions were then constructed.
The second age distribution ("tuna sample") was a subset of the total sample and comprised 733 loggerhead sea turtles captured by crews of commercial tuna vessels in the Azores between 1990 and 1992.
Surprisingly, China's age distribution is not that different from the advanced countries, especially with the sharp decline in number of births in the last 15 years (Figure 2).
Differences in fertility can induce marked differences in the age distribution of a population, and the age distribution has implications for the economy - for patterns of consumption and investment, the capacity to produce output, the level of per capita income, and other characteristics.
Szafran develops and uses age-adjusted labor force participation rates to analyze the way participation would change if the baby boom had not squeezed its way through the age distribution thus far and would not be continuing to affect the age structure of the population.
In this case, a fall in g shifts the age distribution of the population toward older cohorts, and thereby lowers the income-replacement ratio [Psi] that can be supported by the existing payroll tax rate.
The 1986 age distribution revealed a much younger group (figure 4, page 17) of women physicians in administration compared to men, as might be expected because of the only recent increase in the numbers of women physicians available to enter administration.
Because persons with disabilities are generally much older than those without, the age distribution differs considerably between these two groups, making direct comparisons misleading.