Which mathematical technique revolutionized retail market research by enabling retailers to identify natural groupings of customers with similar purchasing behaviors?

Market research in retail relies heavily on mathematical models and statistical analysis to derive meaningful insights. With the advent of advanced analytics tools, mathematical concepts like regression analysis, clustering algorithms, and Bayesian statistics have become crucial for understanding consumer behavior and market trends. How well do you know the mathematical foundations behind modern retail market research?

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K-means clustering
Fourier transform analysis
Laplace equations
Eigenvalue decomposition