qpplot.das: QP plot

In StatDA: Statistical Analysis for Environmental Data

QP plot

Description

This function produces a QP (Quantile-Probability) plot of the data.

Usage

qpplot.das(x, qdist = qnorm, probs = NULL, logx = FALSE, cex.lab = 1,
xlab = NULL, ylab = "Probability [%]", line = TRUE, lwd = 2, pch = 3,
logfinetick = c(10), logfinelab = c(10), cex = 0.7, xlim = NULL,
ylim = NULL, gridy = TRUE, add.plot = FALSE, col = 1, ...)

Arguments

x	data
qdist	The probability function with which the data should be compared.
probs	The selected probabilities, see details
logx	if TRUE, then log scale on x-axis is used
cex.lab	The size of the label
xlab	title for x-axis
ylab	title for y-axis
line	if TRUE the line will be drawn
lwd	the width of the line
pch, cex, col	graphical parameter
logfinetick	how fine are the tick marks on log-scale on x-axis
logfinelab	how fine are the labels on log-scale on x-axis
xlim	the range for the x-axis
ylim	the range for the y-axis
gridy	if grid along y-axis should be drawn
add.plot	if TRUE the new plot is added to an old one
...	futher arguments for the probability function

Details

First the probability of the sorted input x is computed and than the selected quantiles are calculated and after that plot is produced. If probs=NULL then the 1%, 5%, 10%, 20%,...., 90%, 95% and 99% quantile is taken.

Value

No return value, creates a plot.

Author(s)

Peter Filzmoser <[e-mail]> http://cstat.tuwien.ac.at/filz/

References

C. Reimann, P. Filzmoser, R.G. Garrett, and R. Dutter: Statistical Data Analysis Explained. Applied Environmental Statistics with R. John Wiley and Sons, Chichester, 2008.

See Also

plot, par, plot.default

Examples

data(AuNEW)
qpplot.das(AuNEW,qdist=qlnorm,xlab="Au",
ylab="Probabilities of lognormal distribution", pch=3,cex=0.7)

StatDA documentation built on June 7, 2023, 6:26 p.m.