General plots / Alluvial stacked bars
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Each bar is a sample, time point or position along a gradient, and each segment a component. Translucent ribbons join the same component in neighbouring bars: a widening ribbon means a rising share, a narrowing one a falling share.
Bar order is the order of comparison, so arrange the table columns by time or gradient. Ribbons show the change of one component between neighbouring bars, not movement of individuals.
The chart uses percentages by default (each bar = 100%); components are ordered by mean share and those beyond the top 12 are merged into a grey “Other”.
The downloadable “change in share” table lists how many percentage points each component gained or lost between neighbouring bars.
Percentage = component value / sample total × 100; negative and missing values are treated as 0.
Up to 40 displayed components; up to about 100 samples is recommended.
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