What is the purpose of portmanteau test?
What is the purpose of portmanteau test? The main idea underlying these portmanteau tests is to identify if there is any dependence structure which is yet unexplained by the fitted model. Why do we use Ljung Box test? The Ljung (pronounced Young) Box test (sometimes called the modified Box-Pierce, or just the Box test) is a way to test for the absence of serial autocorrelation, up to a specified lag k. What is Box Pierce statistic? The Box–Pierce test statistic is a simplified version of the Ljung–Box statistic for which subsequent simulation studies have shown poor performance. The Ljung–Box test...