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\name{QuantileQuantilePlots}
\alias{qqnormPlot}
\alias{qqnigPlot}
\alias{qqghtPlot}
\alias{qqgldPlot}
\concept{quantile-quantile plot}
\concept{qq-plot}
\concept{qqplot}
\concept{normal distribution}
\concept{inverse Gaussian distribution}
\concept{generalized hyperbolic Student-t distribution}
\concept{generalized lambda distribution}
\title{Quantile-quantile plots}
\description{
Produce quantile-quantile plots for the normal, inverse Gaussian,
generalized hyperbolic Student-t and the generalized lambda
distributions.
}
\usage{
qqnormPlot(x, labels = TRUE, col = "steelblue", pch = 19,
title = TRUE, mtext = TRUE, grid = FALSE, rug = TRUE,
scale = TRUE, \dots)
qqnigPlot(x, labels = TRUE, col = "steelblue", pch = 19,
title = TRUE, mtext = TRUE, grid = FALSE, rug = TRUE,
scale = TRUE, \dots)
qqghtPlot(x, labels = TRUE, col = "steelblue", pch = 19,
title = TRUE, mtext = TRUE, grid = FALSE, rug = TRUE,
scale = TRUE, \dots)
qqgldPlot(x, labels = TRUE, col = "steelblue", pch = 19,
title = TRUE, mtext = TRUE, grid = FALSE, rug = TRUE,
scale = TRUE, \dots)
}
\arguments{
\item{x}{
an object of class \code{"timeSeries"} or any other object which can
be transformed by \code{as.timeSeries}.
}
\item{labels}{
a logical flag, should the plot be returned with default labels and
decorated in an automated way? By default \code{TRUE}.
}
\item{col}{
the color for the series. In the univariate case use just a color
name like the default, \code{col = "steelblue"}, in the multivariate
case we recommend to select the colors from a color palette,
e.g. \code{col = heat.colors(ncol(x))}.
}
\item{pch}{
an integer value, by default 19. Which plot character should be used
in the plot?
}
\item{title}{
a logical flag, by default \code{TRUE}. Should a default title be
added to the plot?
}
\item{mtext}{
a logical flag, by default \code{TRUE}. Should a marginal text be
printed on the third site of the graph?
}
\item{grid}{
a logical flag, should a grid be added to the plot? By default
\code{TRUE}.
}
\item{rug}{
a logical flag, by default \code{TRUE}. Should a rug representation
of the data be added to the plot?
}
\item{scale}{
a logical flag, by default \code{TRUE}. Should the plot be for the
scaled time series? Used by \code{qqnormPlot} only, ignored silently
by the others.
}
\item{\dots}{
optional arguments passed to \code{plot()}.
}
}
\details{
\code{qqnormPlot} produces a tailored Normal quantile-quantile plot.
\code{qqnigPlot} produces a tailored NIG quantile-quantile plot.
\code{qqghtPlot} produces a tailored GHT quantile-quantile plot.
\code{qqgldPlot} produces a tailored GLD quantile-quantile plot.
}
\value{
a list containing some of the quantities computed for the plot,
invisibly. Currently contains the following components:
\item{x}{the quantiles of the reference distribution, used for the
x-axis,}
\item{y}{the (possibly scaled) ordered values of the time series, used
for the y-axis.}
The list has attribute \code{"control"} containing the parameters of
the fitted distribution.
}
\author{
Diethelm Wuertz for the Rmetrics \R-port.
}
\seealso{
\code{\link{seriesPlot}},
\code{\link{returnPlot}},
\code{\link{cumulatedPlot}},
\code{\link{drawdownPlot}}
\code{\link{histPlot}},
\code{\link{densityPlot}},
\code{\link{logDensityPlot}}
\code{\link{boxPlot}},
\code{\link{boxPercentilePlot}}
\code{\link{acfPlot}},
\code{\link{pacfPlot}},
\code{\link{teffectPlot}},
\code{\link{lacfPlot}}
\code{\link{scalinglawPlot}}
\code{\link{returnSeriesGUI}}
}
\examples{
## data
data(LPP2005REC, package = "timeSeries")
SPI <- LPP2005REC[, "SPI"]
plot(SPI, type = "l", col = "steelblue", main = "SP500")
abline(h = 0, col = "grey")
qqnormPlot(SPI)
}
\keyword{hplot}
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