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Frequency Distributions 33
Frequency Distributions
This section describes frequency distributions and how to create and use them with the
Statistics Graphics Toolkit. Think of a frequency distribution as a histogram; indeed, a
histogram is simply a picture of a frequency distribution.
Figure 43.16: Output of the HISTAREA Program.
The “count” of each interval is the number of items in a dataset that is less than or
equal to the top end of the interval, but not in any interval farther to the left.
Absolute vs. Relative Frequency Distributions
In the simplest terms, frequency distributions contain counts and so are integers.
However, true histograms show relative frequency distributions in which each count is
a fraction, and the total area (count x interval width) sums to 1. Percent frequency distributions
are like relative distributions, but the area sums to 100 instead of 1.
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