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Elements of Statistics, by A. L. Bowley. P. S. King & Son, London
Fig. 91. Total Value of British and Irish Produce Exported from the United Kingdom, 1855-1906
The fine dotted line shows a curve plotted from yearly averages. This line fluctuates in such manner that it is difficult to tell the general tendency of
the exports under consideration. Other curves are drawn from the same data but using moving averages of three, five, and ten years to show the effect
in "smoothing" the curve. The heavy line is drawn through points which represent the average for each of the different decades, and it is
smoothed arbitrarily to give the best representation of the trend of exports[No period consistent with other Figs. P2
]
