Usage
panel.dotplot(x, y, horizontal = TRUE,
              pch, col, lty, lwd, 
              col.line, levels.fos,
              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
    expla
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).