The frequency of occurrence of unique words in the novel Moby Dick by Herman Melville.
The data set moby_sample is 2000 values sampled from the moby data set.
M. E. J. Newman, "Power laws, Pareto distributions and Zipf's law." Contemporary Physics 46, 323 (2005). See http://tuvalu.santafe.edu/~aaronc/powerlaws/data.htm for further details.