Skew-Laplace Quantile-Quantile and Percent-Percent Plots
qqskewlap produces a skew-Laplace QQ plot of the
values in y.
ppskewlap produces a skew-Laplace PP (percent-percent) or
probability plot of the values in y.
If line = TRUE, a line with zero intercept and unit slope is
added to the plot.
Graphical parameters may be given as arguments to qqskewlap, and
ppskewlap.
qqskewlap(y, mu = 0, alpha = 1, beta = 1,
param = c(mu, alpha, beta),
main = "Skew-Laplace Q-Q Plot",
xlab = "Theoretical Quantiles",
ylab = "Sample Quantiles",
plot.it = TRUE, line = TRUE, ...)
ppskewlap(y, mu = 0, alpha = 1, beta = 1,
param = c(mu, alpha, beta),
main = "Skew-Laplace P-P Plot",
xlab = "Uniform Quantiles",
ylab = "Probability-integral-transformed Data",
plot.it = TRUE, line = TRUE, ...)y |
The data sample. |
mu |
The location parameter, set to 0 by default. |
alpha, beta |
The shape parameters, both set to 1 by default. |
param |
Parameters of the skew-Laplace distribution. |
xlab, ylab, main |
Plot labels. |
plot.it |
Logical. TRUE denotes the results should be plotted. |
line |
Logical. If TRUE, a line with zero intercept and unit slope is added to the plot. |
... |
Further graphical parameters. |
For qqskewlap and ppskewlap, a list with components:
x |
The x coordinates of the points that are be plotted. |
y |
The y coordinates of the points that are be plotted. |
Wilk, M. B. and Gnanadesikan, R. (1968) Probability plotting methods for the analysis of data. Biometrika. 55, 1–17.
par(mfrow = c(1, 2)) y <- rskewlap(1000, param = c(2, 0.5, 1)) qqskewlap(y, param = c(2, 0.5, 1), line = FALSE) abline(0, 1, col = 2) ppskewlap(y, param = c(2, 0.5, 1))
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