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Compute Pearson and Spearman matrices, plot a masked heatmap, list the top 10 pairs. Concepts: Correlation types; heatmaps; correlation ≠ causation Project A: Masked Pearson + Spearman heatmaps of the 7 numerics; plus a Cramér's V matrix for categoricals. Project B: Temperature vs load: weak Pearson, clearer once split by season — correlation misses U-shapes.
Builds on: B15 · Build: Customer Insights Report (grouping, joining, reshaping)