' I i] 
0.00 7.50 15.00 22.50 30.00 37.50 
i 1 
45.00 52.50 60.00 
PAS 
Fig. 5.29a. Theoretical. 
SUG es aL Se LIS IU 
0.0 7.50 15.00 22.50 30.00 37.50 45.00 52.50 60.00 
= Tt 
Fig. 5.29b. Estimated. 
Fig. 5.29. Autocorrelation coefficient for ARMA(2.1) process (2) 
X,-0.3 X44+0.4 X2=€:+0.7€.,,  €: NO, 1]. 
153 
