Slopegraph

Time trends

Line charts for showing how a quantity changes over time. Six variants from generic to survey-flavored: a simple (year, value) series with optional confidence intervals, the GSS demographic-split chart with presidential-term reference areas, an indexed mode that rebases every series to 100 at a baseline year, a metadata-panel layout, a small-multiples grid, and an Observable Plot rendering.

Economic Time Series

FRED-style economic time series with recession-band shading. Three flavors covering the common use cases: dual-axis comparison for metrics on different scales, index-rebased comparison for relative growth, and economic-shaded with a brush selector for time-range filtering.

County Choropleth

A US county choropleth rendered as inline SVG from a caller-supplied TopoJSON, with theme diverging or sequential ramps, state borders, and a hover tooltip. Use it for print-quality county maps in articles; for zoomable, high-cardinality maps reach for the MapLibre engine instead.

County Choropleth (diverging)

The county choropleth tuned for residual / above-or-below maps: a diverging color scale centered on a reference value (the national mean or zero), so counties read as positive vs. negative at a glance. Same component as County Choropleth — just a centered three-stop domain. Derived from the diverging county maps across the birth_death + Politics data stories (e.g. two-despairs, merchant-right-county-residuals).