Running totals and rates of change answer different questions: how much has...

https://privatebin.net/?cb4ea82ade80e6a5#84AzbKuiFRsp3m9RCnEGyLWea1cerZzfQ6mEoDh67NE4

Running totals and rates of change answer different questions: how much has piled up, and how fast is it changing? With parcels, this article shows why units and time windows matter