I am having trouble understanding how I can go about calculating the sample size required to run a t-test for a NPS score.
For those unfamiliar, NPS is a score that is essentially (# of promoters - # of detractors)/# of total surveys
My understanding is that this is not quite a straight forward proportions test because of the # of promoters - # of detractors aspect of it.
I have referenced this really good page here How can I calculate margin of error in a NPS (Net Promoter Score) result?
But I'm unsure of how to calculate the sample size required for me to reach statistical significance for my test here.
Any guidance is much appreciated.
