Which scientific advancement in retail data analytics first enabled stores to accurately predict customer pregnancies before family members knew?

In the science-driven world of retail analytics, breakthroughs in machine learning have revolutionized how companies understand consumer behavior. Beyond basic purchase tracking, advanced algorithms now reveal hidden patterns across vast datasets. This poll tests your knowledge about a pivotal innovation in retail data science that fundamentally altered the industry's approach to customer understanding. Do you know which analytical breakthrough marked a turning point for science-based retail personalization?

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Target's pregnancy prediction model using purchase pattern analysis
Walmart's weather-correlated inventory prediction system
Amazon's collaborative filtering recommendation engine
Kroger's loyalty card health trajectory modeling