A running total shows how many parcels have arrived so far. A rate of change...
https://www.last-bookmarks.win/a-running-total-adds-up-what-has-come-in-while-a-rate-shows-how-fast-it-comes
A running total shows how many parcels have arrived so far. A rate of change tells you how quickly they’re coming in. This article compares the two, clarifying units and time windows so daily counts don’t get mistaken for parcels per hour on busy shifts.