FinTS (version 0.4-5)

ArchTest: ARCH LM Test

Description

Lagrange Multiplier (LM) test for autoregressive conditional heteroscedasticity (ARCH)

Usage

ArchTest (x, lags=12, demean = FALSE)

Arguments

x

numeric vector

lags

positive integer number of lags

demean

logical: If TRUE, remove the mean before computing the test statistic.

Value

an object of class 'htest'

Details

Computes the Lagrange multiplier test for conditional heteroscedasticity of Engle (1982), as described by Tsay (2005, pp. 101-102).

This is provided for compatibility with 'archTest' in the S-Plus script in Tsay (p. 102).

See Also

AutocorTest

Examples

data(m.intc7303)
intcLM <- ArchTest(log(1+as.numeric(m.intc7303)), lag=12)
# Matches answer on Tsay (p. 102)