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• In 1999, Leland Wilkinson wrote the "Grammar of Graphics", laying out the proposed grammar to build statistical visualizations in the abstract (i.e. not specific to any programming language).
• In 2005, Hadley Wickham created the ggplot2 package, which is an implementation in R of the grammar of graphics.

However, the grammar of graphics has been implemented elsewhere too

plotly is a web interface for creating graphics using the grammar.

Tableau is a proprietary (i.e. not open-source/free) software suite for data visualization.

In fact, Leland Wilkinson used to work at Tableau for many years, and his fingerprints are left all over it.

• Produce two visualizations in Tableau based on two (out of the three) Excel spreadsheets and submit these.
• As your are working, try to identify where the various components of data visualization and data manipulation we've covered lie.
• The bar for grading is low. This HW is really about exploration, not getting "right answers".

• Trying to emphasize: this is not a class on R; it is a class that uses R to implement bigger ideas.
• The value of abstraction:
  • Camera analogy
  • Learning in the Liberal Arts