20.60 Enhanced Plots: Draw Branches as Dotted Lines

prp(model, type=2, extra=106, nn=TRUE, fallen.leaves=TRUE, 
    branch.lty=3)

The branch.lty= option allows us to specify the type of line to draw for the branches. A dotted line is attractive as it reduces the dominance of the branches whilst retaining the node connections. Other options are just the standard values for line type in R:

% Following came from % http://students.washington.edu/mclarkso/documents/line%20styles%20Ver2.pdf Give credit in Further Reading section of Plots.Rnw

The line type can also be specified as an even length string of up eight characters of the hex digits (0–9, a–f). The pairs specify the length in pixels of the line and the blank. Thus lty=“44” is the same as lty=2:

plot(c(0,1), c(0,0), type="l", axes=FALSE, xlab=NA, ylab=NA, lty=2)
plot(c(0,1), c(0,0), type="l", axes=FALSE, xlab=NA, ylab=NA, lty="dashed")
plot(c(0,1), c(0,0), type="l", axes=FALSE, xlab=NA, ylab=NA, lty="44")

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