# qqskewlap: Skew-Laplace Quantile-Quantile and Percent-Percent Plots In HyperbolicDist: The Hyperbolic Distribution

 SkewLaplacePlots R Documentation

## Skew-Laplace Quantile-Quantile and Percent-Percent Plots

### Description

`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`.

### Usage

```qqskewlap(y, Theta, main = "Skew-Laplace Q-Q Plot",
xlab = "Theoretical Quantiles",
ylab = "Sample Quantiles",
plot.it = TRUE, line = TRUE, ...)

ppskewlap(y, Theta, main = "Skew-Laplace P-P Plot",
xlab = "Uniform Quantiles",
ylab = "Probability-integral-transformed Data",
plot.it = TRUE, line = TRUE, ...)
```

### Arguments

 `y` The data sample. `Theta` 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.

### Value

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.

### References

Wilk, M. B. and Gnanadesikan, R. (1968) Probability plotting methods for the analysis of data. Biometrika. 55, 1–17.

`ppoints`, `dskewlap`.

### Examples

```par(mfrow=c(1,2))
y <- rskewlap(1000,c(0.5,1,2))
qqskewlap(y,c(0.5,1,2),line=FALSE)
abline(0,1,col=2)
ppskewlap(y,c(0.5,1,2))
```

HyperbolicDist documentation built on March 18, 2022, 6:23 p.m.