Population Pyramids

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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 - PowerPoint PPT Presentation

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Population Pyramids

Population PyramidsHow to read a population pyramidImagine 2 sideways bar graphsMales leftFemales rightVertical axisageyear of birthHorizontal axisThousandsMillionsPercentYear3 types of pyramids

Expansive typeTriangle/pyramidBase widest partBirth rate high or low? Note the concave sidesDeath rate high or low?Rate of Natural Increase high or low? Which stage of Demographic Transition Model?

Stationary type

Half ellipse shapeBase about the same width as middleBirth rate high or low?Death rate high or low? Note the convex sidesRate of Natural Increase high or low? Which stage of Demographic Transition Model?

Constrictive typeBase narrower than middleIn extreme cases, upside-down pyramidBirth rate high or low?Death rate high or low?Rate of Natural Increase high or low? Which stage of Demographic Transition Model?

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 workforceb.) there was a baby boom

Population Pyramids for Several US Cities & Towns (Upper left corner is the whole US.)Dependency RatioCompares population of dependents (children and elderly) to working-age population0-1415-6465+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)Goldilocks MomentToo hot! Too cold! Just right.Too young! Too old! Just right.

Low dependency ratioNot too many children or elderlyGood for economy why?More pyramids to exploreImmigrants 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 doesnt workCanada 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/ Connecting to your projectThink about the country that you are researching for your Status of Development Project. If youve already looked at your countrys population pyramid, use what you remember about it.If you havent 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 countrys population pyramid? Why? What can you tell about your country from its pyramid?Is there anything distinctive in your countrys pyramid? Why? What does it mean?Examples - Very high or very low numbers of people in certain age groups? A sex imbalance? Etc.