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#' Potential residual plot
#'
#' @description
#' Plot to aid in classifying unusual observations as high-leverage points,
#' outliers, or a combination of both.
#'
#' @param model An object of class \code{lm}.
#' @param print_plot logical; if \code{TRUE}, prints the plot else returns a plot object.
#'
#' @references
#' Chatterjee, Samprit and Hadi, Ali. Regression Analysis by Example. 5th ed. N.p.: John Wiley & Sons, 2012. Print.
#'
#' @section Deprecated Function:
#' \code{ols_potrsd_plot()} has been deprecated. Instead use \code{ols_plot_resid_pot()}.
#'
#' @examples
#' model <- lm(mpg ~ disp + hp + wt, data = mtcars)
#' ols_plot_resid_pot(model)
#'
#' @seealso [ols_plot_hadi()]
#'
#' @export
#'
ols_plot_resid_pot <- function(model, print_plot = TRUE) {
check_model(model)
res <- NULL
pot <- NULL
d <- data.frame(res = hadio(model, 3), pot = hadio(model, 2))
p <-
ggplot(d, aes(x = res, y = pot)) +
geom_point(colour = "blue", shape = 1) +
xlab("Residual") + ylab("Potential") +
ggtitle("Potential-Residual Plot")
if (print_plot) {
print(p)
} else {
return(p)
}
}
#' @export
#' @rdname ols_plot_resid_pot
#' @usage NULL
#'
ols_potrsd_plot <- function(model) {
.Deprecated("ols_plot_resid_pot()")
}
hadio <- function(model, n) {
ols_hadi(model)[[n]]
}
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