One reading before, one after, both taken from outside your own session. That is the whole procedure.
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Record the current figure with the time. Let the window run without interfering. Take one look afterwards from a session that is not yours, and compare. The skipped step is almost always the first: reconstructing the earlier number from memory turns the exercise into an argument the data cannot settle.
Check once rather than repeatedly. At twenty units the variation between checks is larger than the change you are looking for, so three readings leave you with three numbers and no way to choose.
The route and the address. Whether the post deserved attention is decided by the post, and whether a larger figure would change how it performs is a question this metric cannot reach from where it sits. Those belong to a longer run and a decision you have not had to make.
If the two figures differ by roughly what you expected, you are finished. There is no further step, and inventing one only reintroduces the noise the method was built to avoid.
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