We see from Dan’s purchase data, his shopper spent the most money ($110) as they responded with an 8. They rated their lowest amount spent ($57.60) with a 9. The order value when they scored a 5 was only $3.00 less than only order they rated a 10. From this data, we see there’s no correlation between shopping behavior and NPS response. Nor is there any evidence of loyalty.
Net Promoter Score Considered Harmful (and What UX Professionals Can Do About It)
Jared M. Spool

Did you just use one example to disprove correlation? Wait a minute…