Usage
panel.needle(x, y, horizontal = TRUE, pch = if (is.null(groups)) dot.symbol$pch else sup.symbol$pch, col = if (is.null(groups)) dot.symbol$col else sup.symbol$col, lty = dot.line$lty, lwd = dot.line$lwd, col.line = dot.line$col, levels.fos = NULL, groups = NULL, ...)
Arguments
x, y
variables to be plotted in the panel. Typically y is the 'factor'
horizontal
logical. If FALSE, the plot is `transposed' in the sense
that the behaviours of x and y are switched. x is now the `factor'.
Interpretation of other arguments change accordingly. See documentation of
bwplot for a fuller explanation.
pch, col, lty, lwd, col.line
graphical parameters
levels.fos
locations where reference lines will be drawn
groups
grouping variable (affects graphical parameters)
...
extra parameters, passed to panel.xyplot which is
responsible for drawing the foreground points (panel.dotplot only
draws the background reference lines).