Belgian-phones:
Belgium Phone Calls 1950-1973
Description
A list object with the annual numbers of telephone calls, in
Belgium. The components are:
year
-
last two digits of the year.
calls
-
number of telephone calls made (in millions of calls).
Source
P. J. Rousseeuw and A. M. Leroy (1987)
Robust Regression & Outlier Detection. Wiley.References
Venables, W. N. and Ripley, B. D. (2002)
Modern Applied Statistics with S. Fourth edition. Springer.