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LSP 120

LSP 120. Creating Graphs. The Graphs We Will Use. Pie graphs Bar / column graphs Line graphs XY scatter graphs. But…. Each graph works best in a particular situation You need to decide which is best

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LSP 120

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  1. LSP 120 Creating Graphs

  2. The Graphs We Will Use • Pie graphs • Bar / column graphs • Line graphs • XY scatter graphs

  3. But… • Each graph works best in a particular situation • You need to decide which is best • Some will work, some won’t work, there is usually one really good choice, there are often some really bad choices • Let’s look at each graph choice

  4. Pie Charts • You must have all the data in order to use a pie chart • For example, if you are graphing choices of cookies, and the only data you have is: • Oreo 235 million units sold • Chips Ahoy 211 million units sold • Lorna Doone 145 million units sold

  5. Pie Charts • Don’t make a pie chart like this: • What is wrong with this graph?

  6. Pie Graphs • Secondly, make sure the data does not overlap • Consider the following data: • DSL users 26% • Cable modem users 19% • Dial up users 32% • None 23% • Total 100%

  7. Pie Graphs • Note: there is no title on this graph

  8. Pie Graphs • Finally, don’t make a pie with too many slices Look at EnergyConsumption.xls

  9. Bar / Column Charts • Bar / column charts are good when you want to show “amounts” or “levels” of something • For example, four different cities each have a value for the number of traffic accidents: • Chicago 3211 accidents • Detroit 2210 accidents • St. Louis 1349 accidents • Fort Wayne 832 accidents

  10. Bar / Column Charts Look at HomeHeating.xls

  11. XY Scatter Graphs / Line Graphs • These graphs are best at showing how one type of data input changes one output • For example, how as time changes, the sales have gone up • Or, as a person’s height increases, so does their weight • Or, as you drink more drinks, the more drunk you will get

  12. XY Scatter Graphs / Line Graphs

  13. XY Scatter Graphs / Line Graphs • Be careful: A line graph will not treat the first column as X-axis labels; it will treat it as a series of data • Look at Headstart Per Child.xls

  14. Describing Graphs • You should know how to “describe” a graph • Is the graph/data increasing? Decreasing? Flat? Cyclic or periodic? • What is the global or absolute maximum? Minimum? • What is a local or relative maximum? Minimum?

  15. Faulty Graphs • Let’s look at some “faulty” graphs • http://qrc.depaul.edu/djabon/gallery.htm

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