Wald Decomposition Theorem Any zero mean covariance stationary processxt can be represented in the form of xt = 1X j =0 dj t j + j ; where d0 = 1 ; 1X j =0 d 2 j < 1 The termt is white noise and represents the prediction error defined to bet = xt P[xt j xt 1;]...
早稲田大学法学部 長文問題 分析と 対策 問題編 1 R e a d t h e f o l l o w i n g p a s s a g e a n d a n s w e r t h e q u e s t i o n s b e l o w . ① T h e s t u d y o f e c o n o m i c s i s a m o d e r n d i s c i p l i n e . T o d a y e v ...