Calibrating an Imperfect Auxiliary Predictor for Unobserved No-Purchase Choice

• URL: http://arxiv.org/abs/2602.11505v2
• Date: Fri, 13 Feb 2026 05:10:45 GMT
• Title: Calibrating an Imperfect Auxiliary Predictor for Unobserved No-Purchase Choice
• Authors: Jiangkai Xiong, Kalyan Talluri, Hanzhao Wang,
• Abstract summary: Firms typically cannot observe key consumer actions: whether customers buy from a competitor, choose not to buy, or even fully consider the firm's offer.<n>This missing outside-option information makes market-size and preference estimation difficult even in simple multinomial logit (MNL) models.<n>We study a complementary setting in which a black-box auxiliary predictor provides outside-option probabilities, but is potentially biased or miscalibrated because it was trained in a different channel, period, or population.<n>We develop calibration methods that turn such imperfect predictions into statistically valid no-purchase estimates using purchase-only data from the focal
• Score: 1.5484595752241122
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Firms typically cannot observe key consumer actions: whether customers buy from a competitor, choose not to buy, or even fully consider the firm's offer. This missing outside-option information makes market-size and preference estimation difficult even in simple multinomial logit (MNL) models, and it is a central obstacle in practice when only transaction data are recorded. Existing approaches often rely on auxiliary market-share, aggregated, or cross-market data. We study a complementary setting in which a black-box auxiliary predictor provides outside-option probabilities, but is potentially biased or miscalibrated because it was trained in a different channel, period, or population, or produced by an external machine-learning system. We develop calibration methods that turn such imperfect predictions into statistically valid no-purchase estimates using purchase-only data from the focal environment. First, under affine miscalibration in logit space, we show that a simple regression identifies outside-option utility parameters and yields consistent recovery of no-purchase probabilities without collecting new labels for no-purchase events. Second, under a weaker nearly monotone condition, we propose a rank-based calibration method and derive finite-sample error bounds that cleanly separate auxiliary-predictor quality from first-stage utility-learning error over observed in-set choices. Our analysis also translates estimation error into downstream decision quality for assortment optimization, quantifying how calibration accuracy affects revenue performance. The bounds provide explicit dependence on predictor alignment and utility-learning error, clarifying when each source dominates. Numerical experiments demonstrate improvements in no-purchase estimation and downstream assortment decisions, and we discuss robust aggregation extensions for combining multiple auxiliary predictors.

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