stat_density.geom_density(mapping = NULL, data = NULL, stat = "density",
position = "identity", na.rm = FALSE, ...)aes or aes_string. Only needs to be set
at the layer level if you are overriding the plot defaults.FALSE (the default), removes missing values with
a warning. If TRUE silently removes missing values.geom_histogram for the histogram and
stat_density for examples.