Small Multiples for Comparing Groups
Compare many groups without a tangle of lines.
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Design a small multiples chart. Groups and metric: [GROUPS_AND_METRIC]. Number of groups and time points: [COUNTS]. Question to answer: [QUESTION]. Library: [PLOTTING_LIBRARY]. Produce: 1. Why small multiples beat one crowded chart for this data, in three sentences, and the point where they stop working (too many panels). 2. Specification: panel order (sorted by value or by a meaningful grouping), shared versus free axes and the consequence of each, a faint reference line for the overall average in every panel, the highlight rule for panels that cross a threshold, panel titles, and one shared legend. 3. The code, including how to wrap panels into rows. 4. A readability checklist: font sizes, spacing, label every panel directly, avoid repeating axis labels everywhere. 5. Three ways the chart can mislead (free axes hiding scale differences, small groups with noisy lines, sorting that implies a ranking) and how to prevent each. 6. A caption of about 40 words stating the main finding and the caveat. Test the design with a table of three alternate arrangements and say which you would choose.
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