Period-over-period change, relative
also called Delta %Percent changedeltaPct
Definition
The period-over-period change expressed relative to the comparison period rather than in the metric's own units.
Scope, grain and dimensions
- Grain
- One row key × the pair of periods.
- Dimensions
- query · page · country · device · intent · category
- Required filters
- date range · comparison range
- Aggregation
- Computed per row from that row's own two values; null whenever the comparison value is zero, because the ratio is undefined rather than infinite.
- Metric type
- derived metric · relative change
Data sources
Where you'll see this
Named reports that normally include this metric.
AI referral traffic reportContent decay reportContent performance reportKeyword ranking and movement reportMonthly executive search reportWeekly search report
Skills and analyses that use it
Skills carry the judgment; the analysis verbs do the reading.
Analysis verbs
compare_periodssearch_performancegsc_breakdownsignificance_check
Method rungs and levers
A rung tells you what a movement here can and cannot explain, read the rungs below it first.
Ask Quattr
- "What was the percentage change in clicks versus last month?" Simulate this →
- "Which pages fell more than 20 percent?" Simulate this →
Caveats, freshness and failure modes
Null when the comparison value is zero, a row that went from nothing to something has no relative change, only an absolute one.
Relative change on a small base is large by arithmetic; the movement classification and the significance verdict exist precisely because this number alone cannot rank findings.
- Freshness
- 1 to 2 days behind, Google's own reporting lag. Any answer touching the last 48 hours says so on the card.
Common failure modes
- Multiplying an already-percent value by 100 a second time, or reading a fraction as a percent, depending on which code path produced it.
- Ranking a worklist by relative change and filling it with rows that moved from two clicks to four.
Not the same as
The confusions that cause the most wrong decisions.
Period-over-period change, relative Real, noise or can't-tell Compare definitions →
A relative change is a magnitude; a significance verdict is a test result at an alpha. Neither implies the other, and no effect size is computed on either side.
Watch this metric read in a real run
All runs →
2 min 5 secTraffic more than halved in six months. Nobody could say why.Search Console · Anomaly investigator◐Recreated from an anonymized session
3 min 4 secThe fix shipped. Traffic rose. Now two teams want the credit.Lighthouse + Search Console + Rank tracking · Significance referee · Cross domain correlator◐Recreated from an anonymized session
2 min 26 secConversion rate fell 7.5%. The number is real. The panic is not.Web analytics · Significance referee◐Recreated from an anonymized session
2 min 2 secSomething went right this quarter. Now prove it before you say it out loud.Rank tracking + Search Console · SERP feature watch · Significance referee◐Recreated from an anonymized session
Related metrics and workflows
Verification
A definition is the smallest part of this.
The measurement matters because something acts on it. Here is the rest of the showcase, in the order most people find useful.