Before publishing a chart, walk the grammar
Audit a ggplot by data, mapping, geom, scale, and facet.
The fork Ibrahim’s chart is beautiful, but product notices paid users and trial users are mixed in the same line. The issue is not the color palette. The mapping hid two populations. The choice changes what future-you can verify. Layered Grammar of Graphics / ggplot2 The layered grammar of graphics is a chart audit framework. Data asks what rows are in scope. Mapping asks which variables become position, color, size, or labels. Geom asks what visual mark represents the data. Scales ask how values are translated. Facets ask whether comparisons should be split. The mechanism is decomposability: you can inspect…
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