power analysis for NPS score /sample size

[Hansdewit]

in our company we are using NPS as customer satisfaction measurement.  i have to prove that we need to increase the sampling size, so I want to use proc power.

Normally I use proc power for 2 groups, But NPS has 3 groups (promoter, detractor, passive).  

Which method should I use in proc power?

[sbxkoenk · Accepted solution]

Hello Hans,

Have a look to these Communities topics and let us know if it answers your question :

• proc power for multiple groups
  https://communities.sas.com/t5/Statistical-Procedures/proc-power-for-multiple-groups/td-p/273595
• Proc power for multiple group sample size calculation
  https://communities.sas.com/t5/Statistical-Procedures/Proc-power-for-multiple-group-sample-size-calc...
• Sample size calculation for three groups
  https://communities.sas.com/t5/Statistical-Procedures/Sample-size-calculation-for-three-groups/m-p/1...

Koen