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I've looked for the answer across this site and survey sites like MeasuringU but haven't found an answer. Any help is appreciated!

I have a multiple question survey using NPS-style questions but applying to different parts of the customer experience.

  1. How likely is it that you would recommend this company to a friend or colleague?
  2. How likely is it that you would recommend this store branch to a friend or colleague?
  3. How likely is it that you would recommend your cashier to a friend or colleague?

Can I use the NPS calculation across both questions to create a single NPS? The idea is to take a ALL of the promotomer and detractors and use it to create a combined score. Mathematically or logically, why can/can't I do it?

I've seen other sites talk about variations on NPS, but nothing about aggregating questions.

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  • $\begingroup$ Although you can do it, the NPS is already so crude that it would be worth seriously considering a more suitable analysis of the survey. $\endgroup$
    – whuber ♦
    Jul 19, 2022 at 22:33
  • $\begingroup$ Thanks for the answer. Mathematically, what is your reasoning? $\endgroup$
    – fsadlkfj341
    Jul 21, 2022 at 18:46
  • $\begingroup$ It reduces the precision by a factor of almost $3$ by condensing a 1-10 scale into a three-level scale. When you do that to two questions you are giving up a lot of information you might otherwise be able to exploit. $\endgroup$
    – whuber ♦
    Jul 21, 2022 at 19:34

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