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Dec 21, 2014 at 16:09 vote accept clarkson
Nov 10, 2014 at 18:27 comment added mpiktas What precisely you do not understand?
Nov 10, 2014 at 17:22 comment added clarkson Thanks for the explanation.But I don't understand the last part from $cov(Y_t,Y_t)=cov(Y_{t-1},Y_{t-1})+cov(Z_t,Z_t)$
Nov 10, 2014 at 14:09 history answered mpiktas CC BY-SA 3.0