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Measuring Population Change

Measuring Population Change. SIZE AND RATE OF CHANGE. Two aspects of population – demographers most interested in… SIZE RATE OF CHANGE. RATE OF CHANGE.

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Measuring Population Change

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  1. Measuring Population Change

  2. SIZE AND RATE OF CHANGE • Two aspects of population – demographers most interested in… • SIZE • RATE OF CHANGE

  3. RATE OF CHANGE Rate of change indicates how population has changed over a period of time. Population change is often referred to as population growth because populations rarely shrink. Population Change = (Population Final - Population Initial) X 100% Population Initial

  4. ABSOLUTE CHANGE • indicates the actual number of people by which a population has increased or decreased over a period of time • (Population Final - Population Initial)

  5. RELATIVE CHANGE • Relative population change “population growth rate” (GR) • Measures the average annual percentage change over this same time period • Population Change / number of years

  6. How the changes in population are calculated… • Population Growth Rate – The percentage increase in a population over a period of time.  • Population change calculated… (number of births + immigrants)-(number of deaths + emigrants)

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