The number of telephones in various regions of the world (in thousands).
A matrix with 7 rows and 8 columns. The columns of the matrix give the figures for a given region, and the rows the figures for a year.
The regions are: North America, Europe, Asia, South America, Oceania, Africa, Central America.
The years are: 1951, 1956, 1957, 1958, 1959, 1960, 1961.
AT&T (1961) The World's Telephones.
McNeil, D. R. (1977) Interactive Data Analysis. New York: Wiley.
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