Number of U.S. housing starts by month for the years 1965 – 1973
a 9 x 12 matrix, where the entries are the number of housing starts, in thousands
References
Becker, Chambers & Wilks (1988), The New S Language, Brooks Cole.
Friendly, M. (1991). SAS System for Statistical Graphics Cary, NC: SAS Institute, p.380
Examples
hstart.2way <- twoway(hstart, method="mean")
plot(hstart.2way)