In our example, the best newbies (decile one) have a 58% chance of buying again in the next year, while the worst newbies (decile ten) have a 28% chance of buying again next year.
How does this relate to the number of items purchased in a first order?
In deciles seven / eight / nine / ten, customers purchased fewer than 1.2 items in a first order.
In other words, if you want loyal buyers in the future, make sure your first-time buyers are purchasing as many items in a first order as they possibly can. That's your job. Get those newbies to add items to the order, ok?