For each of the following models (a) xt = 0.3xt1 + zt (b) xt = zt 1.3zt1 + 0.4zt2 (c) xt = 0.5xt1 + zt 1.3zt1 + 0.

For each of the following models (a) xt = 0.3xt1 + zt (b) xt = zt 1.3zt1 + 0.4zt2 (c) xt = 0.5xt1 + zt 1.3zt1 + 0. 1