Barcode plots

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Description

Produce barcode plot(s) of the given (grouped) values.

Usage

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barcode(x, outer.margins = list(bottom = unit(2, "lines"),
                                left = unit(2, "lines"), 
                                top = unit(2, "lines"), 
                                right = unit(2, "lines")), 
        horizontal = TRUE, xlim = NULL, nint = 0, main = "", xlab = "", 
        labelloc = TRUE, axisloc = TRUE, labelouter = FALSE, 
        newpage = TRUE, fontsize = 9, ptsize = unit(0.25, "char"), 
        ptpch = 1, bcspace = NULL, use.points = FALSE, buffer = 0.02,
        log = FALSE, outerbox = TRUE)

barcode.panel(x, horizontal = TRUE, xlim = NULL, labelloc = TRUE, axisloc = TRUE, 
              labelouter = FALSE, nint = 0, fontsize = 9, 
              ptsize = unit(0.25, "char"), ptpch = 1, bcspace = NULL, 
              xlab = "", xlaboffset = unit(2.5, "lines"), 
              use.points = FALSE, buffer = 0.02, log = FALSE)

Arguments

x

a vector of values for which the barcode is desired, or a list of such vectors for “side-by-side" barcodes. Matrices are coerced to data frames and treated as lists NA's are allowed in the data.

outer.margins

a list of length 4 with units as components named bottom, left, top, and right, giving the outer margins. Defaults to two lines of text.

horizontal

logical indicating the barcode orientation; the default, TRUE, produces horizontal barcodes.

xlim

the x limits (xmin, xmax) of the plot; the default, NULL, uses the range of the full data, range(unlist(x)), plus the multiplicative buffer.

nint

default, 0, uses no “binning”— i.e., the barcode presents the exact measurements, to the precision of the data set; nint=100 uses roughly 100 “bins” in constructing the barcode; fewer bins give a more histogram-like plot.

main

the plot title.

xlab

the axis label for the quantitative measurements.

labelloc

for the location of the factor labels of the barcodes; default TRUE may also be specified as 'left' or 'top' (having similar results but relating to the horizontal alignment); values 'right' or 'bottom' are available as alternatives to FALSE.

axisloc

for the location of the quantitative axis labels; default, TRUE, may also be specified as 'left' or 'top' (having similar results but relating to the horizontal alignment); values 'right' or 'bottom' are available as alternatives to FALSE.

labelouter

default, FALSE, positions all labels within the viewport; TRUE forces the barcodes to the edge of the viewport, with the labels outside the viewport. May be of use to advanced users.

newpage

default, TRUE, creates the barcodes in a new graphics device instead of adding the plot to the current viewport.

fontsize

for the size of the axis and factor labels.

ptsize

for the size of the plotted points.

ptpch

for the type of plotted points.

bcspace

indicates the proportion of total available space occupied by the barcode part of the displays. Can range from 0 to 1; reasonable values seem to be between 0.1 and 0.5.

use.points

default FALSE uses segments instead of points in the histogram-style display.

xlaboffset

used for tuning the position of the label of the quantitative variable; needs to be a unit.

buffer

an additional proportion of empty space added to the right and left of the barcode, to avoid having the maximum and minimum on the frame of the plot.

log

if TRUE, use the log scale for the y-axis of the histogram-like part of the barcodes.

outerbox

if TRUE, plot a box around the display.

Details

The barcode plot aids in comparing distributions. It shares some of the characteristics of side-by-side histograms or boxplots, and of rugs or stripplots. We have found it particularly useful with clumped data, when other methods obscure detail.

Note

John Hartigan designed and implemented an early version of the barcode plot. The implementation provided here uses grid graphics, adds some useful options, and is better suited for general distribution.

Author(s)

John W. Emerson and Walton A. Green and John A. Hartigan

References

Chambers, J. M. and Hastie, T. J. (1992) Statistical Models in S. Wadsworth \& Brooks/Cole.

See Also

YaleToolkit, gpairs, rug, stripplot

Examples

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# Simulate some data:
x <- list(Rounded.2=round(rnorm(500, 2, 1),2),
          SmallerLevel=c(rnorm(100), rnorm(100,4,1)),
          LargerBivariateRounded.4=round(c(rnorm(500), rnorm(500,3,1)),4))

barcode(x)
barcode(x, main="Different orientatation", horizontal=FALSE)

data(NewHavenResidential)
barcode(split(NewHavenResidential$dep, NewHavenResidential$zone),
        xlab="Percent Depreciation", 
        main=paste("New Haven Residential Depreciation by Residential Zone",
             "RS = Single Family, RM = Mixed Residential", sep = "\n"))

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