Statistics & Probability | Instructor: Suman Ganguli

Category: Examples (Page 2 of 2)

Gapminder: Data & Scatterplots

Please visit and explore the Gapminder website which I will show in class after spring break:

  • the homepage Gapminder.org has links to various features on the site
  • the Tools page has an interactive scatterplot tool which I will show in class:

GapMinder has a LOT of data that is available for download, and so is a very good source for project topics and datasets.  They provide datasets for 519 (!) different “indicators” listed alphabetically–everything from “Adults with HIV (%, age 15-49)”) to “Yearly CO2 emissions (1000 tonnes).”

Browse through the list to get some ideas for project topics (clicking under the “Download” column downloads the data in an Excel file; clicking under “View” opens a Google spreadsheet with the dataset.)

Here is a scatterplot I will show in class titled the “Wealth & Health of Nations“, as measured by life expectancy (a measure of a country’s health) vs. GDP per capita (a measure of its wealth):

gapminder

GapMinder actually shows a time-lapse animation of scatterplots, showing how this paired data set evolved over the past 200 years.

(In fact, they produced a video called “200 years that changed the world” in which Hans Rosling, the medical doctor and statistician who created GapMinder, provides commentary on this time-lapse data.  Rosling became widely known through his TED talks. His first one, from 2006, is titled “The best stats you’ve ever seen“–it’s worth watching!)

“The Aging of America”: Frequency Histograms For US Population By Age

We have constructed a frequency table and histogram for the age distribution in our class. Here are some examples of frequency histograms showing the age distributions of much larger populations–the US population at different times in history (and projected into the future):

  • From the New York Times: “The Aging of America” (Published: February 5, 2011)
  • A similar post appeared on WashingtonPost’s Wonkblog: (published: August 13, 2013), which included this: “This is a mesmerizing little animation created by Bill McBride of Calculated Risk. It shows the distribution of the U.S. population by age over time, starting at 1900 and ending with Census Bureau forecasts between now and 2060.”

What do you notice about how the distributions evolve over time?

Click thru to either the CalculatedRisk blog post on which this animation first appeared or to the WashingtonPost link to read some discussion.

Also here is a related set of histograms that were featured in the NYT Business section in May 2014, as part of an article titled “Younger Turn for a Graying Nation“:

NYT-graying
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