Cleveland Dotcharts

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dotchart(x, labels, glabels, cols=rep(1,2),
        separate=true, divide=true, shrink=1, margin=1,
        ...)

`x`	either a vector or matrix of numeric values (`NA`s are allowed). If `x` is a matrix the overall plot consists of dotcharts for each row juxtaposed.
`labels`	a vector of labels for each point. For vectors the default is to use `names(x)` and for matrices the row labels `dimnames(x)[[1]]`.
`glabels`	in the matrix case, this vector provides labels for each of the juxtaposed row dotcharts. The default is to use the column labels of `x`.
`labcols`	colors to be used for case and group labels.
`separate`	in the matrix case, `separate=true` will cause additional space to be left between the juxtaposed plots.
`divide`	in the matrix case, `divide=true` will cause lines to be drawn between juxtaposed plots.
`shrink`	a magnification factor for the case and group labels. Values less than one can help prevent label overlap.
`margin`	the size of the left margin of the plot in inches.
`...`	graphical parameters can also be specified as arguments.

dotchart produces two variants of dotcharts as described in Cleveland's graphics book.

Dotcharts are a reasonable substitute for barcharts.

Cleveland, W. S. (1985). The Elements of Graphing Data, Monterey, CA: Wadsworth.

load("deaths") dotchart(deaths, main="Death Rates in VA - 1940") dotchart(t(deaths), main="Death Rates in VA - 1940")