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Histograms and Frequency Polygons 39
PlotHist (data(), from, to, step, col$)
Plot the frequency distribution of the raw dataset data(), grouped into bars with centerpoints
at from, from+step, ..., from+k*step ≤ to. All data() values lower than from are
included in a “lo” bar centered at from-step, and all high values are included in a “hi”
bar centered one step beyond the interval’s end. If there are any low or high values,
these bars are flagged with labels lo or hi as appropriate.
The rules governing from, to, and step are described in the “Frequency Datasets” section.
Any missing values in data() are ignored. The color scheme col$ 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 normal curves on subsequent histograms.
See its description at the end of this section.
Figure 43.18: Output of the CUMHIST program.
PlotCumHist (data(), from, to, step, col$)
This routine is precisely like PlotHist except that it plots a cumulative histogram.
It plots a cumulative frequency distribution of the raw dataset data(), grouped into
bars with centerpoints at from, from+step, ..., from+k*step ≤ to. All data() values lower
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