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Scatter and Residual Plots 89
SetDataStyle (ps)
Set the point style ps used to plot individual data points in observation plots and
confidence interval plots. For instance, SetDataStyle(2) will draw data points in point
style 2 in subsequent observation or confidence interval plots. Your ps must be a point
style as defined in the “Making Graphs” section or 0 to omit plotting the raw data
points. By default, raw data is not plotted in these graphs.
AskDataStyle (ps)
The opposite of SetDataStyle. Return the current point style used for raw data points
in observation plots and confidence interval plots.
SetErrorBeam (pix)
By default, error bars are shown as simple vertical lines. You can switch to an I-beam
shape if you wish.
To get I-beams, call SetErrorBeam before you graph a data range. Pass in pix the pixel
length for each side of the cross-bar. The full cross-bar is 2*pix+1 pixels wide.
All subsequent data ranges will be drawn as I-beams with cross-bars of this size. For
most computers, 2 or 3 pixels are enough for a cross-bar. But you can make them as big
as you want. To go back to the simple vertical lines, just pass pix = 0.
AskErrorBeam (pix)
AskErrorBeam is the opposite of SetErrorBeam. It returns the current size of the
cross-bar for error bars (in pixels).
SetObsSD (n)
Call SetObsSD(n) to create error bars n * sd units long, where sd is the standard deviation
of a set of observations. For instance SetObsSD(2) will tell PlotObs to produce
error bars 2 sd’s long about the mean of each observation set. To turn off error bars, call
SetObsSD(0). By default, n = 1.
Notes: use SetSD to control whether the standard deviation is computed with a denominator
of n data items or n – 1. If you call SetObsSD, then SetObsSE will automatically
be turned off.
Exception:
704 SetObsSD can’t be negative: n
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