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-
- _B_o_x _P_l_o_t_s
-
- boxplot(..., range=1.5, width, varwidth=FALSE,
- notch=FALSE, names, data, plot=TRUE, col=NULL,
- border=par("fg"))
-
- _A_r_g_u_m_e_n_t_s:
-
- ... : the data from which the boxplots are to be
- produced. The data can be specified as
- separate vectors, each corresponding to a
- component boxplot, or as a single list con-
- taining such vectors. Alternatively a sym-
- bolic specification of the form x ~ g can be
- given, indicating the the observations in the
- vector x are to be grouped according to the
- levels of the factor g. In this case the
- argument data can be used to provide values
- for the variables in the specification. NAs
- are allowed in the data.
-
- range : this determines how far the plot whiskers
- extend out from the box. If range is posi-
- tive, the whiskers extend to the most extreme
- data point which is no more than range times
- the interquartile range from the box. A
- value of zero causes the whiskers to extend
- to the data extremes.
-
- width : a vector giving the relative widths of the
- boxes making up the plot.
-
- varwidth : if varwidth is TRUE, the boxes are drawn with
- widths proportional to the square-roots of
- the number of observations in the groups.
-
- notch : if notch is TRUE, a notch is drawn in each
- side of the boxes. If the notches of two
- plots do not overlap then the medians are
- significantly different at the 5 percent
- level.
-
- name : group labels which while be printed under
- each boxplot.
-
- plot : if plot is TRUE (the default) then a boxplot
- is produced. If not, the summaries which the
- boxplots are based on are returned.
-
- border : an optional vector of colors for the outlines
- of the boxplots. The values in border are
- recycled if the length of border is less than
- the number of plots.
-
- col : if col is non-null it is assumed to contain
- colors to be used to col the bodies of the
- box plots.
-
- ... : graphical parameters can also be passed as
- arguments to boxplot.
-
- _V_a_l_u_e_s:
-
- This function is usually invoked for its side effect
- which is to produce box-and-whisker plots of the given
- values. However, it also returns a list with one com-
- ponent corresponding to each plot. The components are
- themselves lists with named components as follows:
-
- stats : a vector containing the extreme of the lower
- whisker, the lower hinge, the median, the upper
- hinge and the extreme of the upper whisker.
-
- n : the number of observations in the sample.
-
- conf : the lower and upper extremes of the notch.
-
- out : the values of any data points which lie beyond the
- extremes of the whiskers.
-
- _E_x_a_m_p_l_e_s:
-
- data(insects)
- boxplot(count~spray, data=insects, col="lightgray")
-
-