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This is particularly convenient if the two series being compared have very different ranges of values. Bar and column charts are simple, flexible, and effective techniques for comparing the size of coordinate values or of parts of a total.
This situation is illustrated in Figure 3, where the same data have been plotted on both arithmetic and semilogarithmic grids, placed injuxta position. The basis of comparison is linear or one-dimensional; the length of each bar or column is proportional to the value portrayed.
On the arithmetic grid, the relative rate of growth of the city in comparison to that of the entire state cannot be easily determined; by contrast, the curves on the semilogarithmic chart portray relative rate of growth clearly and correctly. Bar and column charts are very much alike; they differ mainly in that the bars are arranged horizontally in a bar chart and the columns are arranged vertically in a column chart.
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If the slope is steep, the relative rate of change is great.
It makes no difference on what part of a semi logarithmic chart a curve is located; the same slopemeans the same relative rate of change.
For instance, completeness demands that all data points be included in a chart, but often this can be done only at some sacrifice of clarity.
Such problems can be mitigated by the practice (highly desirable on other grounds as well) of indicating the source of the data from which the chart was constructed so that the reader himself can investigate further.
There are, however, certain general goals that should always be kept in mind.
These include completeness, clarity, and honesty; but there is often conflict between the goals.
The horizontal scale does not have to begin with zero unless, of course, the lower limit of the first class interval is zero.
In laying out a frequency polygon the appropriate frequency of each class customarily is located at the midpoint of the interval, and the plotting points are then connected by straight lines.
Figure 2 portrays the characteristic features and basic standards of the rectilinear coordinate graph.Tags: Adult Dating, affair dating, sex dating