FinTS (version 0.4-4)

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)