qplot {evir}

Exploratory QQplot for Extreme Value Analysis

Description

Creates a QQplot for threshold data against the exponential distribution or the generalized Pareto distribution.

Usage

qplot(data, xi = 0, trim = NA, threshold = NA, line = TRUE,
    labels = TRUE, ...)

Arguments

data

data vector

xi

the xi value of a generalized Pareto distribution

trim

value at which data are to be right-truncated

threshold

value at which data are to be left-truncated

line

whether or not a straight line is to be added

labels

whether or not the axes are to be labelled

...

other graphics parameters

Details

If xi is zero the reference distribution is the exponential; if xi is non-zero the reference distribution is the generalized Pareto with that value of xi. In the case of the exponential, the plot is interpreted as follows. Concave departures from a straight line are a sign of heavy-tailed behaviour. Convex departures show thin-tailed behaviour.

See Also

gpd, meplot

Examples

## Not run: data(danish)
## Not run: qplot(danish) 
# QQplot of heavy-tailed Danish fire insurance data