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40 Statistics Graphics Toolkit
than from go in a “lo” bar centered at from-step; high values go in a “hi” bar centered
one step beyond the interval’s end. These bars are flagged with labels lo or hi if nonempty.
The rules governing from, to, and step are described in the “Frequency Datasets”
section. Any missing values in data() are ignored. The color scheme col$ is treated as
usual, so a scheme like “red green blue” gives a red title, green frame, and blue
histogram.
Call SetNormal(1) to automatically superimpose cumulative normal curves on subsequent
histograms. See its description at the end of this section.
PlotFP (data(), from, to, step, ps, ls, col$)
This routine is like PlotHist, except that it plots a frequency polygon instead of a histogram.
It plots the frequency distribution of the raw dataset data(), grouped with centerpoints
at from, from+step, ..., from+k*step ≤ to. All data() values lower than from are included
in a “lo” point centered at from-step, and all high values in a “hi” point centered one
step beyond the interval’s end. If there are low or high values, these end points are
flagged with labels lo or hi.
Figure 43.19: Output of the FP program.
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