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90 Statistics Graphics Toolkit
AskObsSD (n)
The opposite of SetObsSD. Returns the current sd multiplier for error bars in observation
plots.
SetObsSE (n)
Call SetObsSE(n) to create error bars n * se units long, where se is the standard error
of the mean of a set of observations. For instance, SetObsSE(2) will tell PlotObs to produce
error bars 2 sem’s long about the mean of each observation set. To turn off error
bars, call SetObsSE(0). By default, n = 0.
Notes: use SetSD to control whether the standard deviation, and hence the standard
error of the mean, is computed with a denominator of n data items, or n – 1. If you call
SetObsSE, SetObsSD will automatically be turned off.
Exception:
704 SetObsSE can’t be negative: n
AskObsSE (n)
The opposite of SetObsSE. Returns the current se multiplier for error bars in observation
plots.
SetObsBox (f)
Pass f = 1 to use box-and-whisker plots in observation plots, or 0 to return to using the
default (error bars).
AskObsBox (f)
The opposite of SetObsBox. Returns f = 0 if observation plots use error bars, 1 if they
use box plots.
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