![]() The grammer allows for a more compact summary of the base components of a language, and it allows us to extend the language and to handle situations that we have not before seen. You might ask yourself “Why do we need a grammar of graphics?” Well, for much the same reasons that having a grammar is useful for spoken languages. The plot may also contain statistical transformations of the data and is drawn on a specific coordinate system” – from ggplot2 book “…the grammar tells us that a statistical graphic is a mapping from data to aesthetic attributes (colour, shape, size) of geometric objects (points, lines, bars). To quote from Hadley Wickham’s book on ggplot2, we want to “shorten the distance from mind to page”. Developing such a grammar allows for a “theory” of graphics on which to build new graphics and graphics objects. You can think of this as developing the verbs, nouns, and adjectives for data graphics. The grammar of graphics represents an abstraction of graphics ideas and objects. Documentation of the package can be found at The package is available from CRAN via install.packages() the latest version of the source can be found on the package’s GitHub Repository. The package implements what might be considered a third graphics system for R (along with base graphics and lattice). The package was originally written by Hadley Wickham while he was a graduate student at Iowa State University (he still actively maintains the packgae). The ggplot2 package in R is an implementation of The Grammar of Graphics as described by Leland Wilkinson in his book.
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