Graphical displays of quantitative information take on many forms to help us understand both data and models. This course will serve to introduce the student to the most common forms of graphical displays and their uses and misuses. Students will learn both how to create these displays and how to understand them. The class will also cover some principles of visual perception and estimation. We will start with univariate and bivariate data, looking at some commonly used graphs and, after discussing their advantages/disadvantages, then turning to more sophisticated tools. We will then explore some three-dimensional tools, group structure/clustering, and projections of higher dimensional data. As time permits, the course will consider some more advanced graphical models such as statistical maps, networks, and the usage of icons. Given the recent explosion of new tools for internet graphics in R, we will spend a good deal of time focusing on web deployment of interactive graphics and how in particular we can retain their statistical properties while still conveying reasonable information.