221_S08_W1D2_fert_V2[1]

221_S08_W1D2_fert_V2[1] - F e r t i l i t y Population...

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Unformatted text preview: F e r t i l i t y Population Issues Soc 221 W1D2 April 4, 2008 Outline • Reintroduction – the population balancing equation – sources of population change • Fertility – definition – measurement – worldwide levels – U.S. trends and differentials Domain of demography: To describe and explain the basic facts of the human population -- its size, composition, distribution and impact on the social and physical world The Demographic Balancing Equation: POPULATION = FERTILITY + MORTALITY + MIGRATION The balancing equation and sources of population change Population change = (births - deaths) + (in-migrants - out-migrants) = Natural Increase + Net Migration Example of the balancing equation: US population change 2000-2001 Births = 4,052,800 Immigrants = 1,279,800 Deaths = 2,435,300 Emigrants = 214,800 Natural Increase = 4,052,800 - 2,435,300 = 1,617,500 Net Migration = 1,279,800 – 214,800 = 1,065,000 Annual population change = Natural Increase + Net Migration = 1,617,500 + 1,065,000 = 2,682,500 Fertility – Two related meanings: 1. The number of births occurring to an individual woman or 2. The number of births occurring in a population Fecundity vs. Fertility Fecundity : The physiological capacity to produce children Fertility : The actual reproductive behavior of a woman, a couple, or a population Two purposes of fertility measures • Population additions: – Assess the relative number of people added to a population in a given period of time. • Behavioral differences: – Assess childbearing behavior for otherwise similar women in different populations. Measuring Fertility: data sources Rates • Measures used to convey the number of events occurring out of the number “at risk” of such an event during a specific period of time Measuring Fertility (part 1 of 3)...
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221_S08_W1D2_fert_V2[1] - F e r t i l i t y Population...

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