3 min readUpdated April 20, 2026
Naive week-over-week comparison is noisy: holidays, reorgs, a single off day can swing a small team's average by 20%. Vibeshift uses comparable-period logic to make deltas meaningful.
The rules
- Weekly survey
- Compared against the same weekday offset from the previous week.
- Biweekly survey
- Compared against the same weekday offset two weeks ago, not one.
- Monthly survey
- Compared against the same calendar month, one year ago when history allows.
- Holidays
- A known holiday in either period adds a 'holiday-adjusted' caveat to the briefing but does not change the math.
When there's not enough history
For the first few weeks you'll see 'Baseline — no comparison period yet' instead of a delta. This is by design. Once you have 3 comparable periods the briefing switches to delta language.
If the briefing flags a change you don't recognise, click the metric card. The 12-period trend view almost always tells you whether the delta is a real shift or an expected oscillation.
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