qqnl <- function(y, mu = 0, sigma = 1, alpha = 1, beta = 1,
param = c(mu, sigma, alpha, beta),
main = "Normal Laplace Q-Q Plot",
xlab = "Theoretical Quantiles",
ylab = "Sample Quantiles",
plot.it = TRUE, line = TRUE, ...) {
if (has.na <- any(ina <- is.na(y))) {
yN <- y
y <- y[!ina]
}
if ((n <- length(y)) == 0)
stop("y is empty or has only NAs")
x <- qnl(ppoints(n), param = param)[order(order(y))]
if (has.na) {
y <- x
x <- yN
x[!ina] <- y
y <- yN
}
if (plot.it) {
plot(x, y, main = main, xlab = xlab, ylab = ylab, ...)
title(sub = paste("param = (",
round(param[1], 3), ", ", round(param[2], 3), ", ",
round(param[3], 3), ", ", round(param[4], 3), ")", sep = ""))
if (line)
abline(0, 1)
}
invisible(list(x = x, y = y))
}
ppnl <- function(y, mu = 0, sigma = 1, alpha = 1, beta = 1,
param = c(mu, sigma, alpha, beta),
main = "Normal Laplace P-P Plot",
xlab = "Uniform Quantiles",
ylab = "Probability-integral-transformed Data",
plot.it = TRUE, line = TRUE, ...) {
if (has.na <- any(ina <- is.na(y))) {
yN <- y
y <- y[!ina]
}
if((n <- length(y)) == 0)
stop("data is empty")
yvals <- pnl(y, param = param)
xvals <- ppoints(n, a = 1 / 2)[order(order(y))]
if (has.na) {
y <- yvals
x <- xvals
yvals <- yN
yvals[!ina] <- y
xvals <- yN
xvals[!ina] <- x
}
if (plot.it) {
plot(xvals, yvals, main = main, xlab = xlab, ylab = ylab,
ylim = c(0, 1), xlim = c(0, 1), ...)
title(sub = paste("param = (",
round(param[1], 3), ", ", round(param[2], 3), ", ",
round(param[3], 3), ", ", round(param[4], 3), ")", sep = ""))
if (line)
abline(0, 1)
}
invisible(list(x = xvals, y = yvals))
}
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