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In my last two posts, I have used the UCI mushroom dataset to illustrate two things. The first was the use of interestingness measures to characterize categorical variables, and the second was the use of binary confidence intervals...

In my last post, I considered the UCI mushroom dataset and characterized the variables included there using four different interestingness measures. When I began drafting this post, my intention was to consider the question of how the different m...

Probably because I first encountered them somewhat late in my professional life, I am fascinated by categorical data types. Without question, my favorite book on the subject is Alan Agresti’s Categorical Data Analysis (Wiley Series in Probabili...

My last four posts have dealt with boxplots and some useful variations on that theme. Just after I finished the series, Tal Galili, who maintains the R-bloggers website, pointed me to a variant I hadn’t seen before. It's called a bee...

This post is the last in a series of four on boxplots and some of their extensions. Previous posts in this series have discussed basic boxplots, modified boxplots based on a robust asymmetry measure, and violin plots, an alternative that essentia...

This post is the third in a series of four on boxplots and closely related data visualization techniques for comparing subsets of a dataset, or comparing different datasets that we hope or expect to be similarly distributed. The previous two post...

In my last post, I discussed boxplots in their simplest forms, illustrating some of the useful options available with the boxplot command in the open-source statistical software package R. As I noted in that post, the basic boxplot is both useful...

Boxplots are a simple and reasonably popular way of summarizing the range of variation of a real-valued variable across different subsets of data. Typical examples might include diastolic blood pressure across a group of patients, broken dow...

This blog is about the art of exploratory data analysis, which is also the subject of my new book, Exploring Data in Engineering, the Sciences, and Medicine (http://www.oup.com/us/ExploringData). This art is appropriate in situations where y...