Cross-Platform Measurement: Why the Numbers Never Match

No, and lesson one says so in its first refusal. With one channel there is no contradiction to resolve: measuring inside a single channel — defining a conversion and the four ways its figures deceive you — is lesson six of the "Running Google Ads Yourself" course, and that is enough for you. This course exists for the moment a second channel appears and the two of them start claiming the same sale.

Probably not, and the course says it twice rather than once. If your sales are few enough that you know where each one came from, ask rather than measure: the direct question is more accurate than any tool at small counts, and cheaper. Measurement is a tool for scale — it becomes necessary at the point you can no longer ask every buyer. Buying tools before that means paying, learning, and knowing no more than asking already told you. This is the one item in the audit that can send you away without spending anything.

For four reasons the course separates rather than blends. The event may never be sent, or sent incomplete, or sent twice, or sent too late to fall inside the window — and each has a different signature in your numbers. On top of that sits a trap almost nobody knows: the platform records a sale on the date of the click and your store on the date of the purchase, so a "day" on the platform is not a "day" in your store. Lesson three gives you the single-day check that separates these in half an hour with no tool, and lesson four explains why you compare months rather than days.

None of them, and the course refuses to sell you one. A model does not discover the truth — it picks a rule for distributing credit, and every rule has a bias: last touch inflates the closing channels, first touch inflates the discovery channels, and a distributed model looks fair while the split itself is a decision with no evidence. The practical answer is to settle on one model for comparison and read the others for learning. And when you genuinely need an answer rather than an opinion, there is exactly one honest test: switch the channel off and watch your total sales, not the channel’s own figure. The course gives its three conditions and states its cost plainly.

It measures across channels and nothing else. Measuring inside one channel is the Google Ads course; your own questions about your own data are "Analysing Your Business Data"; computing the margin you judge every channel by is "Reading Your Business Numbers"; ownership of the accounts and the measurement tool as an owned asset is "Business and Ad Accounts"; and reading branded search is in the SEO books. One boundary is a hard limit rather than a division of content: what may and may not be sent to a platform about a buyer is the "Personal Data Protection" book, and the course refuses throughout to close a measurement gap by collecting more data about people.

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