"Do countries with higher GDP per capita also have longer life expectancy?" I built a tool that lets you explore questions like that across 48 countries by picking any two of five metrics as scatter-plot axes. Two implementation hinges: (1) metrics that span orders of magnitude (population: Singapore 5.6M to India 1,417M, a 250× range) must be plotted and correlated on a log scale or every point collapses to one corner, and (2) a hand-rolled Pearson correlation coefficient recomputed live as you change axes. Vanilla JS, no chart library, with 34 Node tests on the computation layer.
🌐 Demo:
GitHub:
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