# qplot

From evir v1.7-4
by Bernhard Pfaff

##### Exploratory QQplot for Extreme Value Analysis

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

- Keywords
- hplot

##### 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

##### Examples

```
# NOT RUN {
data(danish)
# }
# NOT RUN {
qplot(danish)
# }
# NOT RUN {
# QQplot of heavy-tailed Danish fire insurance data
# }
```

*Documentation reproduced from package evir, version 1.7-4, License: GPL (>= 2)*

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