Running totals add up parcels or rain over time. Rates of change show how fast...

https://storyquanta.com/s/eroIh5770ECD5iCO7W72u

Running totals add up parcels or rain over time. Rates of change show how fast they arrive or fall. This article sorts out the difference, names units like parcels per day and inches per hour, and shows how a clear time window helps you read a chart.