On the ratio scale, equal vertical distances represent equal percentage differences; that is, the distance from 1 to 2 is the same as the distance from 2 to 4 and from 4 to 8.

B. Key for Assistance in Selecting the Proper Scale for Three - Deck Ratio Paper.

1. If the figures of the data to be plotted

on 3-deck ratio paper fall within the range of any one of these six brackets, the four figures within that bracket indicate the scale to be placed at the 4 points of the 3-deck paper.

2. A similar key could be made for 4-

deck and 5-deck ratio paper.

GRAPHIC PRESENTATION

REFERENCES:

Bivins, Percy A., The Ratio Chart in Business, Codex Book Co., Norwood, Mass., 1926.

Fisher, Irving, "The 'Ratio' Chart for Plotting Statistics," Journal of the American Statistical Association, Vol. XV, June, 1917. (May be obtained from ASA for 75c.)

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