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Three Demographic Variables

Three Demographic Variables - Three Demographic Variables...

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Three Demographic Variables QUESTION: How does population change? The population changes in accordance with three demographic variables: Fertility, mortality, and migration. Population growth or decline in a society is influenced by the birth rate, the death rate, and the migration rate . Crude Birth Rate The Crude Birth Rate is the number of births per year per 1000 people . Demographers can use this measure to estimate population growth. Crude Death Rate The amount of death in a society can be estimated using the Crude Death Rate which is the number of deaths per year per 1000 people. Life Expectancy Life expectancy is the average number of years a person can expect to live given the current mortality levels. Average Age The average age of a population is determined by adding up the ages of each individual in a population and dividing that sum by the number of people in a population. A. Fertility Fertility explores the level of reproduction in a society. It refers to the number of children born to a woman . Fecundity refers to the physical ability to reproduce . Demographers distinguish between population increases that happen because of fertility (or natural increase) and increases that happen because of migration. Keep in mind that population growth will be negative if more people are dying that are being born. The populations of some countries in Europe have entered a negative growth period. Their populations are declining because of changes in fertility patterns. Women are not having children at the replacement rate. Each man and woman needs to reproduce themselves to maintain a stable population. On the other hand some countries are highly pronatalist (e.g., Iraq). B. Mortality The second demographic variable, mortality, refers to dying. This discussion includes a historic component, an age component, and a genetic (sex linked) component.
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