The How
Methodology
The audit captures 116,918 SERPs from a balanced design
engineered for cross-vertical comparability: an equal stratified sample
of 833 commercial keywords per vertical × 18 verticals =
14,994 unique queries, each crawled at organic depth
100 across six Australian cities in May 2026.
Sample design
Verticals were sampled at equal quota - not proportional to market
size - so each industry carries the same statistical weight. The
833-per-vertical figure was set to guarantee a minimum cell size of
n ≥ 100 in every cross-tab cut we report (e.g.
"Real Estate × local intent × mobile"), keeping confidence intervals
tight even at the long tail of the distribution. Keyword universes
were sourced from commercial-intent search data, deduplicated against
brand and adult terms, and filtered to AU search demand.
Geographic coverage
Three metro/regional pairs span the eastern seaboard:
Sydney/Newcastle (NSW),
Melbourne/Geelong (VIC), and
Brisbane/Toowoomba (QLD). Each keyword was issued
from each city to surface genuine geographic divergence in the SERP -
important because Google increasingly localises both organic results
and AI-generated answers.
Device and capture pipeline
70% of impressions were captured on Android mobile - the dominant
share of Australian search - with 30% on desktop as a control. Each
impression ran through an async SERP capture pipeline with
asynchronous-AIO retrieval enabled. Without this, an estimated
30-50% of AIOs that take longer than 2 seconds to render are
silently dropped from the response payload, which would have
materially understated the trigger rate. Parser v1.1.0 captures
both side-panel and inline citations, including domain, URL, rank,
and citation type.
Statistical method
Every percentage in this report carries a 95% Wilson
confidence interval (tighter and better-behaved than naive ±
formulas at the edges of the distribution). Findings whose CI
overlaps zero are flagged as "within noise" in the narrative.
Per-vertical breakdowns are only reported where n ≥ 100 SERPs in the
relevant cell. Snapshot data was captured 11-12 May 2026.
Full methodology, sampling tables, and limitations in the
downloadable report. Source data and SQL cuts available on request:
research@dnhq.com.au.