Analyzing the phenomenon of fluctuating NPS without product changes, focusing on factors like shifting user expectations, sample composition, survivor bias, and sales volume that impact NPS beyond product quality.
Researchers from Queen Mary University of London analyzed over 380,000 song lyrics from 1960 to 2023, finding a decline in words reflecting moral virtues and an increase in vocabulary associated with harm, corruption, and subversion.
Explains the silhouette method for determining the optimal number of clusters (K) in K-Means clustering, including calculation, interpretation, and differences from the elbow method. Evaluation combining three metrics—average, minimum, and negative scores—is key.
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