Return a list object of class "ecm" and "ecmSymFit" with the following components:
ydependend variable
xindependent variable
lagnumber of lags
dataall the data combined for the ECM
IndVardata frame of the right-hand variables used in the ECM
name.xname of the independent variable
name.yname of the dependent variable
ecm.yECM regression for the dependent variable
ecm.xECM regression for the independent variable