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Module 4: Pie Charts and Component Band Charts

Module 4: Pie Charts and Component Band Charts. This module discusses the circumstances for which graphs may be preferred to tables and provides some general information about graphs. It then discusses pie charts and component band charts. Reviewed 15 April 05 /MODULE 4. Graphs versus Tables.

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Module 4: Pie Charts and Component Band Charts

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  1. Module 4: Pie Charts and Component Band Charts This module discusses the circumstances for which graphs may be preferred to tables and provides some general information about graphs. It then discusses pie charts and component band charts Reviewed 15 April 05 /MODULE 4

  2. Graphs versus Tables • Advantages :Simplicity, clarity • Easily remembered visual image • Picture of complex relationships • Emphasis • Popular • Disadvantages : Lack of precision • Lack of flexibility • Provide for distortion

  3. Axes of Reference • Rectangular (cartesian) • Circular (polar, angular) • Geographical

  4. Types of Graphs • Pie Chart • Component Band Chart • Bar Chart • Spot Map • Rate Map • Arithmetic Scale Line Graph • Semi-Logarithmic Scale Line Graph • Histogram • Frequency Polygon

  5. Circular: Pie chart Source: Am J Public Health, Dec.2003; 93:2094 Data are from the US Bureau of the Census

  6. Circular: Pie chart • Frame of reference: Circle of 360 degrees • Use: Show how a whole circle is divided into parts • Rules: Start at 12 o’clock and include segments in descending order of magnitude • Title : State what, how classified, where and when in reference to slices • Source: Reference for data published elsewhere • Caution:Using two or more pie charts side by side to depict the relative magnitude of the parts of two or more entities generally does not work well. The component band chart is a much better graphical device for this situation.

  7. Source: Am J Public Health, Dec.2003;93:2094

  8. Source: Am J Public Health, Dec.2003;93:2094

  9. Source: Am J Public Health, March 2003;93:440

  10. Source: Am J Public Health, Dec.1999;6:830

  11. Component Band Chart

  12. Component Band Chart • A type of bar chart • Ideal for comparing two or more sets of percentages • A pie chart is generally better for one set of percentages

  13. Source: Am J Public Health, Jan. 2004;94:56

  14. Source: Am J Public Health, May 2004;94:838

  15. Source: Am J Public Health, Dec. 1999;89:1859

  16. Source: Am J Public Health, April 2004;94:534

  17. Source: Am J Public Health, Feb. 1997;87:665

  18. Source: Am J Public Health, March 2003;93:440

  19. Source: Am J Public Health, March 2003;93:440

  20. Source: Am J Public Health, Sept. 2001;91:1393

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