Measurement

Measured in business value

Rankings are a diagnostic, not an outcome. Every formula here resolves to something the business can bank, and every one names the grain it must be measured at.

SEO is a partially observed causal system. Search engines do not expose every internal variable, so the measurement model separates:

Never infer success from a proxy without checking the downstream outcome it is supposed to influence.

The five primary KPIs

Incremental organic contribution margin
Qualified organic conversions
Value-weighted non-brand clicks
Value-weighted target-cluster visibility
Eligible canonical coverage

The outcome hierarchy

Five levels, from business outcomes down to technical states. A metric at a lower level is only worth watching because of the level above it.

Level 1 Business outcomes

qualified leads
sales
subscription starts
retained customers
expansion revenue
support value
contribution margin
customer lifetime value

Level 2 Journey outcomes

task completion
next-step action
assessment completion
demo request
quote request
trial start
qualified form
return visit
renewal action
referral/review

Level 3 Search outcomes

impressions
search appearances
average position / rank distribution
clicks
CTR
landing sessions
branded demand
non-branded demand

Level 4 Asset and graph diagnostics

query-cluster coverage
canonical ownership
internal in-links
click depth
orphan state
qualified referring domains
content/evidence completeness
freshness

Level 5 Technical states

discoverable
crawlable
renderable
canonicalized
indexable
indexed
retrievable
valid structured data
field performance

The 12 formulas

Actual organic contribution margin

ACTUAL ORGANIC CONTRIBUTION
=
Σ(
  attributed organic conversions
  × contribution margin per conversion
)
− attributable SEO operating cost

Incremental lift

INCREMENTAL LIFT
=
(Post_treatment − Pre_treatment)
−
(Post_control − Pre_control)

When a reasonable comparison group exists:

Apply separately to:

- impressions;

- clicks;

- qualified conversions;

- revenue;

- contribution margin;

- retention.

Expected value

EXPECTED VALUE
=
Σ(
  demand estimate
  × probability of eligibility
  × probability of useful visibility
  × expected CTR
  × expected qualified conversion rate
  × contribution margin
)
− expected cost

Every estimated input must be labeled and later replaced with observed data.

Value-weighted visibility

VALUE-WEIGHTED VISIBILITY
=
Σ(
  query opportunity value
  × observed visibility weight
)
/
Σ(query opportunity value)

Visibility weight may be based on impression share, rank distribution, or a calibrated CTR curve.

CTR residual

CTR RESIDUAL
=
Observed CTR
− Expected CTR(
    position,
    device,
    country,
    brand class,
    query class,
    search appearance
  )

This is more useful than a universal “good CTR” threshold.

Qualified conversion value

QUALIFIED ORGANIC VALUE
=
organic value events
× qualification probability
× contribution margin

Opportunity score

OPPORTUNITY SCORE
=
(
  demand confidence
  × business fit
  × task value
  × information advantage
  × attainable response gap
  × conversion value
  × evidence confidence
)
/
(
  effort
  × risk
  × maintenance burden
  × time to learning
)

Eligible canonical coverage

ELIGIBLE CANONICAL COVERAGE
=
priority canonical URLs that are eligible and indexed
/
all priority canonical URLs intended for indexing

Canonical agreement

CANONICAL AGREEMENT
=
URLs where intended/declarative canonical agrees with observed selected canonical
/
evaluated duplicate or canonical URLs

Cannibalization indicators

DOMINANT URL SHARE
=
largest URL impression share for cluster
/
total cluster impressions

High entropy is a diagnostic, not automatic failure. Confirm same-intent duplication, instability, divided links, or value loss.

Internal graph diagnostics

PRIORITY ORPHAN RATE
=
priority pages with no useful crawlable internal in-link
/
all priority pages

Authority diagnostics

QUALIFIED LINK RATE
=
retained relevant editorial referring domains
/
all acquired referring domains

Event dictionary

Event, Definition, Required properties — 12 rows
Event	Definition	Required properties
`organic_landing`	Session begins on an organic search landing page	landing URL, cluster, query class
`task_start`	User initiates the primary page task	task ID
`task_complete`	User reaches a valid completion condition	task ID, method
`next_action`	User takes the intended adjacent step	action ID
`qualified_form`	Form meets qualification rules	offer, segment, qualification
`sales_accept`	Sales accepts the lead	CRM status
`closed_value`	Revenue or margin is confirmed	value, margin, offer
`retention_value`	Renewal, expansion, or support outcome	customer, event value
`evidence_interaction`	User opens data, sources, demo, comparison, or case proof	evidence ID
`internal_path`	User follows a meaningful graph edge	edge type, target
`calculator_complete`	Tool returns a valid result	inputs band, result band
`download_use`	User downloads or uses a template	asset ID

Baseline protocol

1. Verify data collection.
2. Define treatment object and exposure.
3. Record at least the available stable pre-period.
4. Record query mix, device, country, brand class, and seasonality.
5. Record technical eligibility.
6. Record current page and graph state.
7. Record current business value.
8. Assign change ID.
9. Predefine primary metric and guardrails.
10. State minimum exposure and review rule.