20100929 ggplot - triangle useRs group presentation

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20100929 ggplot - triangle useRs group presentation

  1. 1. ggplot2 Elaine McVey BD Technologies Triangle Area R useRs Group September 29, 2010
  2. 2. What is ggplot2? ggplot2 is an R package written by Hadley Wickham that provides a comprehensive framework for statistical graphics based on The Grammar of Graphics (LeLand Wilkinson, 2005)
  3. 3. Goal To show you enough about ggplot2 that you can understand its capabilities, get started using it, and know where to learn more.
  4. 4. Benefits • Since ggplot2 has an underlying conceptual framework, it becomes very powerful once you understand it. • ggplot2 code is concise and readable • Writing statistical functions (i.e. panel functions) for ggplot2 is relatively easy. • ggplot2 enforces the link between the data and the legend, so labeling errors are minimized. • The layering concept makes it easy to combine data from different dataframes in a single plot. • The active user community provides a good place to get help and drives ongoing development.
  5. 5. Jumping In - Dataframe
  6. 6. Jumping In – First Plot
  7. 7. Layers
  8. 8. More Layers - oops
  9. 9. More Layers - corrected
  10. 10. Non-Mapped Attributes
  11. 11. Accidental Aesthetic Mapping
  12. 12. Aesthetic Mapping by geom
  13. 13. Bigger Dataframe
  14. 14. Facets and Colors
  15. 15. Statistical Summaries
  16. 16. Creating errBars
  17. 17. Lattice Comparison
  18. 18. Expanding errBars
  19. 19. Layering Dataframes plyr aside:
  20. 20. Layering Dataframes in geoms
  21. 21. Updating Plots
  22. 22. Where to go next 1) ggplot2: Elegant Graphics for Data Analysis (skip qplot) 2) had.co.nz/ggplot2 (& plyr & reshape . . . ) 3) Google group listserv
  23. 23. Defaultstatisticsandaestheticsforeachgeom

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