Use a quick layer checklist to debug ggplot charts.
Data layer vs mapping layer Check data before mapping when totals or populations look wrong. “The chart looks confusing; change the colors.” Your line Let’s first confirm the plotted rows and mappings. Color is a theme or scale fix after the meaning is right. Polishing a chart whose data claim has not been audited. It prevents design tweaks from masking analytical defects. What does facet_wrap() buy you? It repeats the same visual specification across groups for comparable small multiples. Use it when the same relationship should be compared across categories. When is a scale fix the right fix? When labels,…
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