Cumulative, MAD, and Signal

Cumulative Errors

Cumulative errors show whether signed misses are building up.

highlighted = computed this step

Cumulative Error

Cumulative error keeps a running sum of signed errors.

cumulative error=running sum of errors\text{cumulative error}=\text{running sum of errors}
Cumulative errorsThe table exposes signed, cumulative, and absolute errors.cumulative error rowserrorcumulativeabsoluteperiod one222period two131period three-121period four242

Final Cumulative

The final cumulative error is 4.

final cumulative error=4\text{final cumulative error}=4
Tracking signalThe chart shows cumulative error bars and exact summary metrics.cumulative error and signalMAD 3/2; tracking signal 8/3periodactualforecasterrorcumabs120182222222113132122-12142523242period 1cum 2period 2cum 3period 3cum 2period 4cum 4final cum4MAD3/2tracking signal8/3what-if MAD 1; tracking signal 2