The period over which a measure is computed: trailing three months for a run rate, twelve weeks for a baseline, eight weeks for an acceptance trend. Stated with every figure and the same for every account in a comparison.
Short windows are current and noisy. Long windows are stable and stale. The choice is stated, not assumed.
A ranking that compares a one-month figure to a six-month one is not a ranking.
The period a measure is computed over is stated with the measure: trailing three months for a run rate, twelve weeks for a baseline, twelve months for share. Changing the window changes the number.
Dormancy uses each account's orders over 24 months. Coverage uses the cadence of the tier. Share of wallet uses trailing twelve months.
Windows left implicit. Two people compute the same measure over different periods and both are right.