boxplot.formula             package:base             R Documentation

Formula Notation for Box Plots

Description:

     Produce box-and-whisker plot(s) of the given (grouped) values
     using formula notation.

Usage:

     boxplot(formula, data = NULL, ..., subset)

Arguments:

 formula: a formula, such as `y ~ x'.

    data: a data.frame (or list) from which the variables in `formula'
          should be taken.

     ...: arguments to the default boxplot method and graphical
          parameters may also be passed as arguments, see `par'.

  subset: an optional vector specifying a subset of observations to be
          used for plotting.

Details:

     This is a method of the generic function `boxplot'.  It operates
     by setting up the data from the formula specification, and then
     calling `boxplot.default'.

See Also:

     `boxplot.default'

Examples:

     data(OrchardSprays)
     boxplot(decrease ~ treatment, data = OrchardSprays,
             log = "y", col="bisque")

