"ggplot2 is an R package for
producing statistical, or data, graphics, but it is unlike most other graphics
packages because it has a deep underlying grammar. This grammar, based on the Grammar of Graphics, is composed of a set of independent components that can be composed in many different ways. Plots can be built up iteratively and edited
later. A carefully chosen set of defaults means that most of the time you can
produce a publication-quality graphic in seconds, but if you do have special
formatting requirements, a comprehensive theming system makes it easy to do
what you want.
ggplot2 is designed to work in a
layered fashion, starting with a layer showing the raw data then adding layers
of annotation and statistical summaries."
"ggplot2 is a plotting system
for R, based on the grammar of graphics, which tries to take the good parts of base and lattice graphics and none of the bad parts. It takes care of many of
the fiddly details that make plotting a hassle (like drawing legends) as well
as providing a powerful model of graphics that makes it easy to produce complex
multi-layered graphics."
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