A running total adds up what has come in, while a rate shows how fast it comes...

https://wiki-velo.win/index.php/What_Units_Do_I_Get_When_I_Integrate_a_Rate_Like_mm_per_Hour%3F

A running total adds up what has come in, while a rate shows how fast it comes in. Use parcel counts to see why 20 parcels by noon differs from 5 parcels per hour, and why units and time windows matter when you read a work chart.