“

My interpretation of [Leland Wilkinson’s] grammar [of statistical graphics]:

—**Data** is the most important thing, and the thing that you bring to the table.

—Geometric objects … what you actually **see** on the plot: points, lines, polygons, etc.

—**Statistics transform the data** in many useful ways. For example, binning and counting to create a histogram. They are optional, but very useful.

—Scales map values in the **data space** to values in an **aesthetic space**, whether it be colour, or size, or shape. Scales also provide an inverse mapping: a legend.

—A coordinate system describes **how data coordinates are mapped to the plane of the graphic**. It also provides axes and gridlines to make it possible to read the graph.

— A facetting, or **conditioning**, speci

”

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*Hadley Wickham*

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**Tags:** chart, Data, econometrics, ggplot2, graphics, Hadley Wickham, Leland Wilkinson, plot, R, Statistical graphics, statistics, visualisation