#### Introduction

Last week, I wrote the first post in a series on exploratory data analysis (EDA). I began by calculating summary statistics on a univariate data set of ozone concentration in New York City in the built-in data set “airquality” in R. In particular, I talked about how to calculate those statistics when the data set has missing values. Today, I continue this series by creating box plots in R and showing different variations and extensions that can be added; be sure to examine the details of this post’s R code for some valuable details. I learned many of these tricks from Robert Kabacoff’s “*R in Action*” (2011). Robert also has a nice blog called Quick-R that I consult often.

Recall that I abstracted a vector called “ozone” from the data set “airquality”.

ozone = airquality$Ozone

#### Box Plots – What They Represent

The simplest box plot can…

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