This is useful when plotting points with a categorical axis so to avoid overplotting.
the plot object to modify
named list of aesthetic mappings, see details for more information
other options, see details for more information
data source, if not specified the plot default will be used
Aesthetic mappings that this grob function understands:
x:x position (required)
y:y position (required)
size:size of the point, in mm (see
shape:shape of the glyph used to draw the point (see
colour:point colour (see
These can be specified in the plot defaults (see
aesthetics argument. If you want to modify the position
of the points or any axis options, you will need to add a position scale to
the plot. These functions start with
xjitter:degree of jitter in x direction, see
jitter for details, defaults to 1 if the x variable is a factor, 0 otherwise
yjitter:degree of jitter in y direction, see
jitter for details, defaults to 1 if the y variable is a factor, 0 otherwise
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