Constructing a normal Q-Q plot

This function will construct a normal Q-Q plot within the ggplot2 framework. It combines the functionality of qqnorm and qqline.

ggplot_qqnorm(x, line = NULL, ...)

Arguments

x	a numeric vector
line	the method used to fit a reference line. If no reference line is desired, leave the value as `NULL`. `line = "rlm"` will use robust regression to fit a reference line. `line = "quantile"` will fit a line through the first and third quartiles. These options are the same as those given for the `qqPlot` function in the `car` package.
...	other arguments to be passed to `qplot()`