This utility function is useful to use in the portmanteau functions,
BoxPierce
, MahdiMcLeod
, Hosking
,
LiMcLeod
, LjungBox
, and portest
.
GetResiduals()
function takes a fitted time-series object
with class "ar"
, "arima0"
, "Arima"
,
("ARIMA forecast ARIMA Arima")
, "lm"
, ("glm" "lm")
,
"varest"
, or "list"
.
and returns the residuals and the order from the fitted object.