This document discusses data visualization and the ggplot2 package in R. It explains that ggplot2 is an implementation of Leland Wilkinson's Grammar of Graphics, which breaks graphs down into semantic components like scales and layers. It also notes that ggplot2 must be installed and loaded to be used, and should not be reinstalled if it is already present. Finally, it outlines that ggplot2 graphs have three main components: the data, the geometry defining the graph type, and the aesthetics specifying which variables are plotted.

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3.  ggplot2, dplyr, and magrittr packages must
be installed and loaded, if you haven’t
already.

4.  ggplot2, dplyr, and magrittr packages must
be installed and loaded, if you haven’t
already.
DO NOT INSTALL
PACKAGESTHAT
ALREADYARE
INSTALLED

6. Visualization is any technique for creating images,
diagrams, or animations to communicate a message.

7. ggplot2 is a data visualization package (one of
many) for the statistical programming language
R.
Created by HadleyWickham in 2005, ggplot2 is
an implementation of LelandWilkinson's
Grammar of Graphics—a general scheme for
data visualization which breaks up graphs into
semantic components such as scales and layers.

8.  The ggplot2 package must be installed.
 If installed, the ggplot2 package must be
loaded.
 As with all R packages, do not install this
package if the package already is installed—
merely load the installed package.

10.  A grammar constitutes the structure and
systems for communication.
 A grammar of language consists of syntax
(arrangement of words for meaning) and
morphology (meanings of words in
language).
 A grammar of graphics consist of system of
syntax and meaning to communicate
understanding of data.

13.  Data is a data frame containing variables to be
plotted;
 Geometry defines the type of graphics (histogram,
box plot, line plot, density plot, dot plot....); and
 Aesthetics indicate the variables to be plotted.This
component also can control the color, the size, or the
shape of points plotted, the height of bars drawn, etc.

16. data

17. data
geometry

18. data
aesthetics
geometry

20. which is the same as

32. http://docs.ggplot2.org/current/

34. https://psu.box.com/v/R-Cheats

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