Which marketing metric is specifically used by leading mathematics education companies to demonstrate the effectiveness of their adaptive learning algorithms?

In the world of mathematics education and products, marketing strategies have evolved significantly over the years. Educational technology companies use various metrics to measure the effectiveness of their math learning products. This poll tests your knowledge about how math product companies evaluate and market their educational solutions based on quantifiable outcomes.

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Knowledge Half-Life (KHL)
Learning Velocity Index (LVI)
Cognitive Retention Score (CRS)
Mathematical Fluency Quotient (MFQ)