Compare weeks with different holiday patterns
Avoid mistaking a calendar effect for a marketing change.
The scenario
An online store sees fewer orders during a week with two shipping cutoff days than during a normal week.
A year-over-year view aligned to the same holiday period can be more informative than a simple adjacent-week comparison. Orders per open fulfillment day provide another angle.
Apply it to your own work
Mark holidays, promotions, outages, and cutoffs. Compare like weekdays and show both absolute volume and normalized rates.
What to watch for
Normalization can hide genuine volume loss. Keep actual revenue alongside any adjusted interpretation.
Compare an equivalent operating window
Line up the same weekdays relative to the holiday, then mark the delivery cutoff and store hours. A late holiday can shift orders into a neighboring week. Show both weeks together if that is how buyers actually experienced the offer.
Calculate orders per open fulfillment day only as a diagnostic. A normal daily rate across fewer days can still mean lower total contribution. For staffing and budget, record both the normalized rate and the actual amount lost or moved.
Try a related tool
Divide remaining spend by the days left in a campaign. Adjust the daily figure for changes in expected demand.
