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Population Pyramids

Population Pyramids. How to read a population pyramid. Imagine 2 sideways bar graphs Males – left Females – right Vertical axis age year of birth Horizontal axis Thousands Millions Percent Year 3 types of pyramids…. Expansive type. Triangle/pyramid Base – widest part

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Population Pyramids

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  1. Population Pyramids

  2. How to read a population pyramid • Imagine 2 sideways bar graphs • Males – left • Females – right • Vertical axis • age • year of birth • Horizontal axis • Thousands • Millions • Percent • Year • 3 types of pyramids…

  3. Expansive type • Triangle/pyramid • Base – widest part • Birth rate – high or low? Note the concave sides • Death rate – high or low? • Rate of Natural Increase – high or low? • Which stage of Demographic Transition Model?

  4. Stationary type • Half ellipse shape • Base – about the same width as middle • Birth rate – high or low? • Death rate – high or low? Note the convex sides • Rate of Natural Increase – high or low? • Which stage of Demographic Transition Model?

  5. Constrictive type • Base – narrower than middle • In extreme cases, upside-down pyramid • Birth rate – high or low? • Death rate – high or low? • Rate of Natural Increase – high or low? • Which stage of Demographic Transition Model?

  6. Asymmetry in Pyramids typically, most pyramids show symmetry. Any asymmetry means . . . a.) there is something that happened/happens that accounts for a difference in female and male population – examples: war, restrictive population policies, migrant workforce b.) there was a baby boom

  7. Population Pyramids for Several US Cities & Towns (Upper left corner is the whole US.)

  8. Dependency Ratio • Compares population of dependents (children and elderly) to working-age population • 0-14 • 15-64 • 65+ • Why do we use these ages? • What might be some problems with using these ages? Percent of population under age 15 (darker color means higher percent)

  9. Goldilocks Moment • Too hot! Too cold! Just right. • Too young! Too old! Just right. • Low dependency ratio • Not too many children or elderly • Good for economy – why?

  10. More pyramids to explore • Immigrants to US from various countries http://www.migrationinformation.org/DataHub/pyramids.cfm • US 1850-2000 http://vis.stanford.edu/jheer/d3/pyramid/shift.html - but link doesn’t work • Canada 1921-2009 http://strategy.sauder.ubc.ca/antweiler/edutainment/pyramid.pdf • Several major countries 1950-2050 http://visualization.geblogs.com/visualization/aging/ • Australia 1971-2056 http://www.abs.gov.au/websitedbs/d3310114.nsf/4a256353001af3ed4b2562bb00121564/ca0b3137794a766bca256f6c0078cb0b!OpenDocument • World 1950-2100 http://populationpyramid.net/ • Various, including some historical US, and WWII Germany http://gero.usc.edu/AgeWorks/core_courses/gero500_core/demographics_lect/index_a.htm • UK vs. Mozambique http://www.bbc.co.uk/schools/gcsebitesize/geography/population/population_change_structure_rev5.shtml • UK 1971-2085 http://www.neighbourhood.statistics.gov.uk/HTMLDocs/dvc1/UKPyramid.html • China 1950-2050 http://www.china-europe-usa.com/level_4_data/hum/011_7a.htm • India http://populationcommission.nic.in/facts1.htm • Japan 1950-2050 http://econviews.wordpress.com/2011/03/19/japans-demographic-crisis-part-2/

  11. Connecting to your project • Think about the country that you are researching for your Status of Development Project. • If you’ve already looked at your country’s population pyramid, use what you remember about it. • If you haven’t looked at it yet, make an educated guess based on what you know about the country. • Questions to consider: • How can you use what we learned today in your project? • What shape is your country’s population pyramid? Why? • What can you tell about your country from its pyramid? • Is there anything distinctive in your country’s pyramid? Why? What does it mean? • Examples - Very high or very low numbers of people in certain age groups? A sex imbalance? Etc.

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