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help for ^mountain^                                                (STB-33: sg58)
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Mountain plots
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    ^mountain^ variable [^if^ exp] [^in^ exp] [, ^nog^raph]
           [other graph options]


Description
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Implements Monti's (1995) folded EDF (or mountain) plot.  Can only be used for
one variable at a time; however, a new variable (FOLDX) is left in the data
set.  Unless the ^NOG^raph option is used, a plot will automatically be
provided (but not saved); options used include ylab, xlab, yline(5) (so can
see 5th and 95th percentiles), xline at median, and c(l).  The new variable is
quietly dropped on re-use of the command.

If user has more than one measure of something and wants to compare the
plots, then ^rename^ FOLDX to something meaningful and re-run; then can plot
the two mountains against what each is measuring (be sure to sort on the x
variable before graphing).

Note that a new version of @egen@ rank is used that does not give the average
rank to tied values since this would give a misleading plot in many cases.
Instead unique ranks are given to all values even if tied; tied values can be
seen in the plot because they are joined by absolutely vertical lines as long
as they do not cross the median; if they cross the median, then they are
joined by absolutely horizontal lines.


Reference
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Monti, K.L. (1995), "Folded Empirical Distribution Function Curves -- Mountain
Plots," _The American Statistician_, 49: 342-5


Author
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    Richard Goldstein
    Qualitas, Inc.
    richgold@@netcom.com