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Author: Arthur L. Bowley (1869-1957)
In one of the first statistical textbooks, Arthur Bowley (1901) illustrated an arithmetic and graphical analysis of time-series data using the total value of British and Irish exports from 1855-1899.  He presented a line graph of the time-series data, supplemented by overlaid line graphs of 3-, 5- and 10-year moving averages.  His goal was to show that while the initial series showed wide variability, moving averages made the series progressively smoother.
Category: Statistics & Graphics