Every piece names its sources. Where we relied on somebody else's estimate, we say so, and where we did the arithmetic ourselves we show it.
I published a resolution rate in August. Re-running the measurement four weeks later, I found the denominator had been wrong the whole time, and the fix changes what I would tell a client.
A redesign moved our community link into the footer. Signups fell, and it took three weeks before anyone connected the two. So I went to see where everyone else keeps theirs.
I set out to measure whether members or staff carry a community. The number that stopped me was neither: almost a third of people asked a question in a busy room and got silence.