Abstract:Godfrey's (1979) Lagrange multiplier (LM) test for examining the adequacy of an autoregressive-moving average (ARMAI process of order (p,q) is based on testing restrictions, r, against an alternative of ARMA (p+r,q) or A M (p,q+r). This paper investigates the finite-sample distribution of the LM test for different choices of r. Additionally, the effect of the nature of the data on the empirical performance of the test is examined. Monte Carlo results indicate that (i) the chi-squared approximation to the distr… Show more
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