When the bars are adjacent to each other as they are in this chart, the similarity between the bar form and the curve form of high-low chart is more pronounced. See 276B.

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New York Herald Tnbune. March 13. 1939. C. Trend of Prices on the New York Stock Exchange Market from 1929 to March 1939.

Note the method of changing the scale to give monthly data for recent periods of time.

ill

Chapter 35 COMPARISONS WITH CURVES

^^^H types of curve charts covered in this chapter are simple comparisons of more than two curves, progressive average curves, moving average curves, and normal trend curves.

REFERENCES

Croxton, Frederick E., and Dudley J. Cowden, Applied General Statistics, Prentice Hall Inc., New York City, 1939.

Karsten, Karl G., Charts and Graphs, Prentice-Hall, Inc., New York City, 1923.

PERCENT

National Association of Motor Bui Operators. Washington, D. C., "Bus Facts for 1938."

SCALE .7

A Comparison of the Percentage of Sales of Five Types of Motor Coaches in the United States from 1929 to 1937.

1. The total of the percentages which the lines represent is one hundred.

2. One way of differentiating a large number of curves plotted on one grid is shown here.

3. It might have been better to connect the labels to the lines with arrows, eliminating the

necessity for putting them at an angle.