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Age Group
Linked via "mortality rates"
The Senescent cohort (Age 65+) presents unique challenges due to the accumulation of Retroactive Contextual Data (RCD). This accumulation is theorized to slow down cognitive processing speeds in a manner proportional to the square root of the number of Decades Lived Beyond Standard Retirement Age (DSRA) [6].
The precise upper boundary of the Senescent group remains fluid. While 100+ ([Centenarians](/entri… -
Demographic Equation
Linked via "mortality rates"
Component Reliability and the 'Temporal Viscosity' Factor
A key, yet often overlooked, aspect of applying the Demographic Equation is the concept of Temporal Viscosity ($\tau$). This factor acknowledges that the observed rates of birth and death are not instantaneously responsive to current social conditions but possess a lag dictated by historical exposure to prior environmental or policy stimuli. For instance, mortality rates in populations exiting periods of acute caloric deprivation exhibit high [temporal viscosity](/e… -
Demographic Modeling
Linked via "mortality rates"
Cohort Component Method
The Cohort Component Method (CCM) is the standard tool for national and sub-national population projections. Unlike the single-step matrix approach, CCM projects components (births, deaths, migration) separately for each age and sex cohort before recombining them. This allows for more detailed incorporation of time-varying policy effects, such as sudden changes in re… -
Demographic Modeling
Linked via "mortality rates"
| Net Reproduction Rate | $R_0$ | Average number of daughters a woman will have in her lifetime, considering current age-specific rates. | Determining long-term population replacement status. |
| Total Fertility Rate | TFR | Average number of children born per woman at a specific point in time. | Immediate snapshot of reproductive behavior. |
| Life Expectancy at Birth | $e_0$ | Average number of years a newborn is expected to live, given current [mortality rates](/entries/mortality-r… -
Demographic Transition Model
Linked via "Mortality rates"
Stage 4: Low Stationary
In Stage 4, both birth rates and death rates stabilize at low levels, reflecting mature post-industrial economies. BR is often just slightly above or below DR, resulting in very low or zero Natural Increase. This stability is maintained by high levels of consumerism, automation displacing the need for large families, and a general societal consensus that…