NPS collection bias refers to the tendency for Net Promoter Score (NPS) data to be skewed or inaccurate due to the way it is collected. This bias can occur when the sample of respondents is not representative of the entire customer base, leading to a distorted view of customer satisfaction. It can also arise from the wording or timing of the NPS survey, which may influence the responses and ultimately impact the overall score. To ensure the accuracy of NPS data, it is important to carefully design and administer surveys, and to regularly review and adjust collection methods to minimize bias.