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.