I'm trying to calculate if the difference between two NPS changes is significant.

For clarity: I have groups $a$ and $b$; group $a$'s NPS increased by $20$, group $b$'s NPS increased by $10$, so the change for group $a$ in comparison to group $b$ is $10$. I want to check if the difference of the differences is significant, not just the change in NPS for group $a$ and group $b$.

I'm asking as I have used a different significance test for NPS in the past, and wondered how you can apply that (or if you need to apply that) to this.



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