Back in the old days, when many data sets were still small,
stem-and-leaf
plots were a common
method of representing quantitative data. John Tukey’s Exploratory Data
Analysis,
which popularized stem-and-leaf plots, has a nice example on the cover.

Playground

In 2013 I needed an excuse to try out D3 and
CoffeeScript, so I made an interactive
playground for stem-and-leaf plots. The original CoffeeScript code and
transpiled JavaScript are available on
GitHub.

The plot updates as you change the values in the textarea. Try adding
negative values, very large values, or even fractions. If you hover over
the leaves you see the original values. The example data comes from
EDA’s cover.

Would you like to receive an email whenever I have a new blog post, organize an event, or have an important announcement to make? Sign up to my newsletter: