Abstract
IN connection with many teleph one problems of an economic character, it is necessary to develop methods for making estimates and forecasts of the effects of changes in conditions. When the changes in conditions are such that direct experimentation is impracticable the development of logirnl methods and bases for estimates involves analyses of past experience in specific situations and, in so far as is feasible, the generalization of such experience. It is the purpose of this paper to describe briefly a graphical method by which complex economic data may be generalized for use in forecasting probable future conditions.
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