This is a position adjustment specifically for
geom_density_ridges() and related geoms. It
only jitters the points drawn by these geoms, if any. If no points are present, the plot
remains unchanged. The effect is similar to a sina plot: Points are randomly distributed to fill
the entire shaded area representing the data density.
position_points_sina(rel_min = 0.02, rel_max = 0.98, seed = NULL)
The relative minimum value at which a point can be placed.
The relative maximum value at which a point can be placed.