Which mathematical technique is revolutionizing retail analytics by creating digital 'heat maps' of store traffic patterns without using cameras or tracking individual shoppers' phones?

The retail mathematics industry has evolved significantly with advanced analytics and data-driven decision making. Retailers now leverage sophisticated mathematical models to optimize everything from inventory management to customer experience. This trivia question explores an innovative math-based technology that's transforming how retailers analyze shopper behavior in physical stores.

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Pressure-sensitive floor tiles using matrix calculations to analyze foot traffic density and movement vectors
Bayesian inference algorithms applied to WiFi signal strength variations
Acoustic triangulation using hidden microphones and Fourier transform analysis
RFID triangulation with probabilistic modeling of anonymous tag movements