Add a density curve to a plot

For example, a plot a normal density over a histogram of conditional weighted residuals.

add_density(
  fun = dnorm,
  col = pm_opts$density.col,
  lwd = pm_opts$density.lwd,
  lty = pm_opts$density.lty,
  ...
)

layer_dnorm(x, sd = 1, mean = 0, ...)

Arguments

fun	passed to ggplot2::stat_function
col	passed to ggplot2::stat_function
lwd	passed to ggplot2::stat_function
lty	passed to ggplot2::stat_function
...	passed to ggplot2::stat_function
x	a ggplot object to which the density line will be added
sd	passed to stats::dnorm
mean	passed to stats::dnorm