a stem and leaf plot is used in exploratory data analysis.
a stem and leaf plot is used in exploratory data analysis.
when is a stem and leaf plot used?
in exploratory data analysis
a stem-and-leaf display or stem-and-leaf plot is a device for presenting quantitative data in a graphical format, similar to a histogram, to assist in visualizing the shape of a distribution. they evolved from arthur bowl's work in the early 1900s, and are useful tools in exploratory data analysis. stemplots became more commonly used in the 1980s after the publication of john tukey's book on "exploratory data analysis" in 1977. the popularity during those years is attributable to their use of monospaced (typewriter) typestyles that allowed computer technology of the time to easily produce the graphics. modern computers' superior graphic capabilities have meant these techniques are less often used.
stem-and-leaf display
for negative numbers, a negative is placed in front of the stem unit, which is still the value x / 10. non-integers are rounded. this allowed the stem and leaf plot to retain its shape, even for more complicated data sets. as in this example below:









































section::::usage.
stem-and-leaf display