How to create a beast mode for email open rate
I wanted to draw a chart to show email open rate over time.
For a specific email, it was send on a day, then opver the next fews, emials were opened. So the open rate will be #of email opened/# of email sent. # of email opened should sum up the total opens of everyday, but # of email sent is the same over the time.
How to create such beast mode? Thank you