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TÜMÜ
random walk If the value of the time series at time \( t \) is the value of the
series at time \( t -1\) plus a completely random movement determined by
a white noise process \(w_t\); e.i. if $$x_t=x_{t-1}+w_t$$ or
equivalently $$x_t=\sum\limits_{j = 1}^t {{w_j}}, t=1,2,....$$then the
generating process is called random walk.
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