Graphic Methods for Presenting Facts
This relation of two curves to each other, with the peaks of one curve following at some definite distance behind the peaks of another curve, is generally referred to as "lag." Students of economics are continually finding curves which are seen to have a very great dependence upon each other when "lag" is taken into account. If "lag" is not considered, a great difference in the shape of the curves might be taken to show that there was absolutely no relation between the facts from which the curves were plotted.
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Fig. 137. Loans Each Month Made to Employees of a Large Industrial Corporation and Amounts Paid Back Each Month. Number of Accounts Opened and also Number of Accounts Closed Are Shown on a Cumulative Basis