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9.1 The ARAR Algorithm 319<br />

and choose the lag ˆτ to be the value of τ that minimizes Err(τ).<br />

2. If Err ˆτ ≤ 8/n,gotoL.<br />

3. If ˆφ ˆτ ≥ .93 and ˆτ >2, go to L.<br />

4. If ˆφ ˆτ ≥ .93 and ˆτ 1 or 2, determine the values ˆφ1 and ˆφ2 of φ1 and φ2 that<br />

minimize n t3 [Yt − φ1Yt−1 − φ2Yt−2] 2 ; then go to M.<br />

5. If ˆφ ˆτ

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