Stationarity The white noise series &, satisfies the stationarity condition because (1)E(6)=0 (2)Var()=02 (3)Cov(1s)= for all s≠09 Stationarity  The white noise series satisfies the stationarity condition because (1) E( ) = 0 (2) Var( ) = (3) Cov( ) = for all s 0 t  2   t  t  t  t s  −