Before a large mailing, sample your list. You can test to a subset of your list. Think of it as an email campaign dress rehearsal. Using a technique called nth-testing, you pull every nth record from your list to create a near-random set of subgroups.
For example, if you have 1,000 names, and you nth on every 10, each of those 1,000 names is assigned a value of 0, 1, 2, 3, 4, 5, 6, 7, 8 or 9.
If you want to create two random "test" segments, you would send one offer to segment 0 and another to segment 1. You would then send the best-performing offer to segments 2 through 9.
Next: Test at the same time
