I'm working with the "rugarch" package in R. This package provides the weighted Ljung-Box test for the standardized residuals and for the standardized squared residuals. What are the null hypothesis of both of these tests?
I couldn't understand the explanation provided in the vignette. I also tried to figure out from the article in the references, but I'm new on working with GARCH models, so I couldn't understand much of it. Can anyone tell me in a simple way what are the null hypothesis?