Wong, Heung; Ling, Shiqing - In: Journal of Time Series Analysis 26 (2005) 4, pp. 569-579
This paper obtains the joint limiting distribution of residuals and squared residuals of a general time-series model. Based on this, we propose a mixed portmanteau statistic for testing the adequacy of fitted time-series models. In some cases, it is shown that this statistic can be simply...