Page:Graphic methods for presenting facts (1914).djvu/17

 of change. A grand total cumulative curve plotted from several other cumulative curves. Cumulative curves for the determination of storage requirements for water supplies.

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The arrangement of objects so that their position shows a crude frequency curve. Vertical bars to represent frequency. Frequency curves. The "mode." Frequency curves much easier to interpret than charts using bars or areas. Cumulative frequency curves. The use of cumulative frequency curves for business problems. Cumulative frequency curves preferably plotted on a "more than" basis instead of on a "less than" basis. Necessity for making the independent variable the horizontal scale. Wage comparisons for industrial work. Studies of the percentage of clerical work and percentage of revenue from orders of various sizes. Pin boards to record costs of doing work on orders of different size. Theoretical curves for percentage of clerical work and percentage of revenue from orders of different size. The Lorenz curve. Correlation curves. "Shot-*gun" diagrams. Plotting curves to represent numerous points. Shaded areas to represent numerous dots. Correlation charts for two independent variables. Isometrically ruled paper for chart work.

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Map presentation of prime importance. Shading of different areas. The Ben Day method of mechanical shading. Lines of equality. Profiles. Maps with circles or dots representing quantities. Shaded areas with a key to represent quantity. Miscellaneous methods. Map charts showing traffic. Map models with built up strips to show quantities.

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Map tacks projecting above the map. Map pins pushed in till the heads touch the map. Photographing pin maps. Mounting maps for use with map pins. Wall maps for use with pins. Map cabinet systems. Pin maps for advertising work. Pins bearing identifying numbers. Spot maps to a scale with each dot representing some large quantity. Routing systems. Various types of pins and beads available. Bead maps and their great advantages.

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Peak-top curves versus flat tops. Methods for combining curves with figures recording the data. Cards for plotting curves for operating records. Advantages of the card method for instantaneous comparison of different curves. Typical operating curves for a manufacturing business. Typical records for a selling organization. Arrangement of the card system for extension with increase of business. Moving average curves for operating records. Record cards for preserving all information regarding each curve.