A data set from Oehlert (2000) \emph{A First Course in Design and
Analysis of Experiments}, New York: W. H. Freeman.

Columns are origin city (1=NY, 2=NH), destination city (1=DC,
2=LA, 3=Ely), long distance company (1=A, 2=M, 3=S), time slot,
and distortion score.