what kind of test is needed to test a stationarily constant curve what test does an arma curve test what is stationarity of arch why does an arma curve need stationarity why is stationarity needed for arc what is the relationship between stationarity and arch which model is needed for unconditional variance what is the weaker stationarity in arma curve what is the difference between a stationary and an arma curve? how can we measure stationarity in a garch model which test is used in an arma-gardh model what is stationarities in arch can an armache model be tested for conditional variance when do we use a stationarity model what would be the test for stationarity in argch model do i test for stationarity in an arma curve what test is used to find stationarity of a curve model? why is stationarity needed for an arma model which model does arga test what test do we have to use on an arma curves model to confirm its stationariness?