Nomological validity of the Net Promoter Index question

Purpose – The purpose of this study is twofold. First, it aims to provide a review of the Net Promoter© Index (NPI), the evidence of its ability to predict financial performance, and the evidence of its superiority to other voice of customer metrics. Second, it seeks to investigate the nomological validity of the Net Promoter question. It aims to view the NP question as an alternative to the traditional word-of-mouth measure, which is one of the components of customer loyalty. The nomological validity of NP was evaluated in a model including customer satisfaction as an antecedent and repurchase intention as a consequence. Design/methodology/approach – The data for empirically addressing a set of hypotheses related to the nomological validity were collected via self-administered questionnaire. A total of 159 participants completed questions for banking services, 153 individuals completed questions for hairdresser/barber services, and 132 completed questions for cell phone services. The hypotheses were test...

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