ABSTRACT
This chapter discusses a variety of plots designed for studying the distribution of a set of data. A simple but common need arises in data analysis when it have a single set of numbers that are measurements, observations, or values of some variable, and people want to understand their basic characteristics as a collection. Many questions can be answered by carefully studying a table, especially if the data have first been ordered from smallest to largest. Plots of the data can be far more revealing, even though it may be harder to read exact data values from a plot. Two sets of data will be used to illustrate the methodology. One is the daily maximum ozone concentrations at ground level recorded between May 1, 1974 and September 30, 1974 at a site in Stamford, Connecticut. The second set of data is from an experiment in perceptual psychology.
