22. A producer of picture frames uses a tracking signal with
limits of 4 to decide whether a forecast should be reviewed.
Given historical information for the past four weeks, compute
the tracking signal and decide whether the forecast should be reviewed.
The MAD for this item was computed as 2.
week actual sale forecast accumulated deviation tracking signal
6 3
1 12 11
2 14 13
3 14 14
4 16 14
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