The Net Promoter Score is a simple measure used by several companies as indicator of customer loyalty. Studies that address the statistical properties of this measure are still scarce and none of them considered the sample size determination problem. We adopt a Bayesian approach to provide point and interval estimators for the Net Promoter Score and discuss the determination of the sample size. Computational tools were implemented to use this methodology in practice. An illustrative example with data from financial services is also presented.

翻译：网络促进者评分是若干公司用来作为客户忠诚指标的一个简单计量标准,涉及这一计量的统计特性的研究仍然很少,没有一项研究考虑抽样规模确定问题。我们采用了巴伊西亚办法,为网络促进者评分提供点和间距估测器,并讨论抽样规模的确定问题。还采用了计算工具,在实践中使用这一方法。还提供了金融服务数据的一个示例。</s>