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We note that Cov(xt,,x{tk})>0 for k=1,2,3. and then Cov(xt,x{tk})=0 for k>3. What would be a good model choice? AR ARMA MA White noise

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We note that Cov(xt,,x{tk})>0 for k=1,2,3. and then Cov(xt,x{tk})=0 for k>3. What would be a good model choice? AR ARMA MA White noise

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