Concept · article 11 of 14

Comparing today
vs last week.

Why the chip in the corner of the home tile says "vs last Tuesday" and not "vs yesterday".

Ibrahim Ölmez Ibrahim ÖlmezFounder · nouz · 4 min read · Updated this week
Tuesdays compare to Tuesdays. The today-tile chip on Home compares this Tuesday against last Tuesday — never against Monday. Day-of-week is the only honest comparison for retail.

The same-day-of-week comparison is a small detail with huge implications for how you read your numbers. Once you internalise it, "yesterday vs today" comparisons stop making sense.

01 The same-day rule

Wherever nouz shows a "vs previous" comparison, it picks the same day-of-week from the previous week — unless the metric is week- or month-scoped, in which case it goes back one full period.

02 Why it's more useful

A Saturday and a Wednesday are different businesses. Comparing them tells you nothing useful — only that weekends are different. Comparing today to the same day last week tells you something real: are like-for-like conditions improving or not?

03 Where it shows up

  • Home tile chip — today vs same day last week.
  • KPI strip chips — this period vs previous equivalent period.
  • Statistics insights — peak/weak detection uses day-of-week medians, not running averages.

04 Exceptions to the rule

A few cases use period-over-period instead of day-of-week:

  • Week-level comparisons. "This week vs last week" compares full weeks (Mon-Sun), not Tuesday vs Tuesday.
  • Monthly P&L chip. Compares against the same calendar month previous year (when available) or previous month.
  • Year totals. Compare against the previous year, not the equivalent day.
Holidays can confuse the comparison. If last Tuesday was a public holiday and you were closed, the same-day comparison has no baseline. nouz handles this by skipping closed days in the comparison, but the chip may be quieter than expected.

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