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I. xt=0.5+xt1+et II. yt=yt1+1+et III. wt=1+0.5et1+et IV. zt=1+0.4zt1+et Which ones of these processes contain a stochastic trend
I. xt=0.5+xt1+et II. yt=yt1+1+et III. wt=1+0.5et1+et IV. zt=1+0.4zt1+et Which ones of these processes contain a stochastic trend
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