What are the improvement statistics?
The improvement statistics show you by how many percentage points a message
is better than the one right below it. Depending on your A/B Test Settings preferences,
it is calculated based on the message opened or link clicked ratio. This option gives you instant information on how much better the winning message is in comparison the other ones.
The formula that the improvement stats are calculated by is as following:
(open rate or click rate of the current message divided by the open rate or click rate of the message below)-1