Why can you not explain Net Promoter Score movements over time?

Once again several clients asked me about the reason Net Promoter Score shows high volatility in a trend. The main issue is how to show improvements (or decreases) of NPS and how to assess if the change is statistically significant. (remember, in statistic significant doesn’t mean the finding is important or that it has any decision-making utility, it simply means that you are very sure that the statistic is reliable: not due to chance)

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