Normalize Metrics Before Comparing Email With Other Channels

Compare email with SMS, WhatsApp, or push only after the team agrees on metric names, denominators, eligibility, attribution, and observation windows. Use Migma as the email artifact and email-evidence surface; use the cross-channel platform for channel selection and reporting. A shared dashboard does not make unlike events equivalent.

Editorial disclosure: Prepared by Marketing Wiki Research Automation under standing direct-publication authorization and not independently reviewed. Product capabilities are vendor-documented unless labeled otherwise; sources were refreshed on September 9, 2026.

Klaviyo's September 8 Channel Performance update brings email, SMS, WhatsApp, and push into one view. Its dashboard guide documents channel, conversion metric, time-range, and comparison controls. Treat those as selectors, not a ready-made causal model.

Freeze the comparison question#

Write one sentence before exporting results:

For contacts eligible for both channels, compare the proportion completing the same purchase event within seven days of one assigned message during the same campaign window.

That statement names population, outcome, window, exposure, and assignment. “Which channel performed best?” names none of them.

Build a metric dictionary#

Scroll table →

Field	Email definition	Other-channel definition	Comparable?
Attempted	Provider accepted send request	Define explicitly	Only with matched rejection rules
Delivered	Receiving server accepted message	Carrier/app acceptance may differ	Directional unless semantics match
Open/view	Mail client loaded content	App receipt or view may differ	Usually no
Click/action	Recorded tracked-link event	Tap, reply, or action event	Only after event contract review
Conversion	Selected business event in window	Same event and window	Potentially
Opt-out	Email marketing unsubscribe	Channel-specific opt-out	Compare carefully, never combine identities blindly

Migma's metric glossary distinguishes sent, delivered, opens, clicks, bounces, and unsubscribes and notes important email-specific limitations. Preserve those definitions rather than renaming every engagement event “interaction.”

Choose one denominator contract#

Possible denominators answer different questions:

Assigned population: tests the routing decision, including delivery failures.
Attempted sends: evaluates provider execution after exclusions.
Delivered messages: evaluates observed response among accepted deliveries.
Eligible contacts: evaluates the policy-defined opportunity before assignment.

Publish the raw numerator and denominator beside every rate. If channel eligibility differs, show the eligible overlap and the channel-only populations.

Keep the Migma email version identifiable#

Use Migma's creation workflow to build the email from the same approved offer, audience premise, and destination used in the channel experiment. Record the Migma artifact version, subject, content promise, CTA, sender, and Preflight result.

The comparison does not require identical creative. It requires an explicit treatment record. A 300-word email and a 160-character SMS can serve the same job while presenting different information; document that difference.

Control the assignment and overlap#

Create fixtures for email-only, other-channel-only, both-channel, and neither-channel eligibility. Decide whether eligible contacts are randomized, routed by a declared rule, or exposed to both. Exclude holdouts from delivery denominators but keep them in assignment analysis.

Check frequency caps, quiet hours, consent, suppression, device availability, geography, and prior exposure. A channel may appear stronger because it received the easier population.

Reconcile attribution separately#

Use one conversion event, dedupe key, value rule, refund rule, and observation window. Record whether attribution is last-touch, first-touch, multi-touch, or experimental incrementality. Do not infer channel causality from attributed value alone.

Klaviyo's dashboard allows a conversion metric selection; that does not prove the event has identical completeness or latency for every channel.

Review the result in three layers#

Execution: assigned, attempted, delivered, failed, and suppressed.
Observed response: recorded clicks, replies, or channel-native actions with coverage limits.
Business outcome: deduplicated conversions and value within the fixed window.

Use Migma's campaign results to inspect the exact email campaign, click map, A/B result, and recipient evidence where applicable. Keep cross-channel conclusions in the normalized analysis, not inside one channel's interface.

Stop conditions#

Stop comparison when metric names hide different event semantics, denominators are absent, eligible populations differ without disclosure, attribution windows diverge, a contact can be counted twice, tracking coverage changed, the email version is unknown, or dashboard totals cannot be reconciled to raw counts.

Evidence limits#

Klaviyo documents the dashboard surface and Migma documents email metrics and result views. Marketing Wiki did not test calculations, event latency, identity resolution, assignment, attribution, consent, or outcomes. The contract makes differences visible; it does not make observational channel data causal.