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78 Statistics Graphics Toolkit
The datasets’ point styles are taken in order from the GraphPoint set – plus, asterisk,
circle, and so on – and cycle through the set if you plot more than 12 datasets in one
graph. (Style #1 isn’t used since it’s hard to see.)
If connect is nonzero, each data point is connected to its neighbors by a straight line.
You can use SortPoints2 to make sure your data points are in order. If you’ve used
SetLS to turn on fitted lines, each dataset gets its own line. Confidence bands and connecting
or fitted lines have the same colors and line styles. To distinguish them, use
PlotScat and AddPlotScat to control colors and line styles.
Size(x,1) gives the number of datasets. Each is identified by a label from legends$() just
below the graph’s title, so Size(x,1) must equal Size(legends$).
The col$ string gives the color scheme; thus “red yellow green blue” gives a red title,
yellow frame, and green and blue datasets. If you give more datasets than data colors,
PlotManyScat uses different line styles to distinguish the connecting or fitted lines.
First it draws solid lines in the colors you’ve chosen. Then it switches to dashed, dotted,
and then dash-dotted lines. So if you graph five datasets with connecting lines in the
color scheme above, you get (in order): solid green, solid blue, dashed green, dashed
blue, dotted green. See the “Making Graphs” section for more help.
Compare the output of Figures 43.04 and 43.05 to see the correlation differences.
Figure 43.35: Output of the LINEFIT program.
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