1. ggplot2
Elaine McVey
BD Technologies
Triangle Area R useRs Group
September 29, 2010

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. Goal
To show you enough about ggplot2 that you
can understand its capabilities, get started
using it, and know where to learn more.

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. Jumping In - Dataframe

6. Jumping In – First Plot

7. Layers

8. More Layers - oops

9. More Layers - corrected

10. Non-Mapped Attributes

11. Accidental Aesthetic Mapping

12. Aesthetic Mapping by geom

13. Bigger Dataframe

14. Facets and Colors

15. Statistical Summaries

16. Creating errBars

17. Lattice Comparison

18. Expanding errBars

19. Layering Dataframes
plyr aside:

20. Layering Dataframes in geoms

21. Updating Plots

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

26. Defaultstatisticsandaestheticsforeachgeom