pub fn phones() -> Result<DataFrame, PolarsError>Expand description
§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).
§Usage:
phones
§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.