diagnosticsigt {ig}R Documentation

Influence diagnostics plots for the IGTD

Description

The function diagnosticsigt() produces an index plot of total local influence.

Usage

  diagnosticsigt(x, kernel = "normal", mainTitle = "", yRange = NULL)

Arguments

x Vector of observations.
kernel Kernel of the pdf of the associated symmetrical distribution by means of which the IGTD is obtained. The kernels: "laplace", "logistic", "normal" and "t" are available.
mainTitle An overall title for the plot.
yRange Limit for the y axis.

Details

The local influence diagnostics method (Cook, 1986) is used to evaluate the local influence by means of likelihood displacement.

Value

diagnosticsigt() gives an influence diagnostics through a graphical plot for the IGTD from a sample of observations.

Author(s)

Víctor Leiva <victor.leiva@uv.cl; victor.leiva@yahoo.com>,
Hugo Hernández <hugo.hernandez.p@gmail.com> and
Antonio Sanhueza <asanhueza@ufro.cl>.

References

Sanhueza, A., Leiva, V., Balakrishnan, N. (2008). A new class of inverse Gaussian type distributions. Metrika (in press).

Examples

## Generates a sample from the IGTD with normal kernel
x <- rigt(300, mu = 1.0, lambda = 1.0, kernel = "normal")

## Produces influence diagnostics for the IGTD with normal kernel
diagnosticsigt(x, kernel = "normal")

[Package ig version 1.2 Index]