Tableau: Calculate 14 Day Change in Covid Cases
Updated: May 13, 2021
Step 1:
Start with date on rows, and sum([Cases]) on Text

Step 2:
Create a lookup calculation to find the value from 14 days ago. Lookup(sum([Cases]),-14)

Step 3:
Calculate the difference by subtracting the two.
Sum([Cases]) – [14 Days Ago]
