Grouped Stacked Bar Chart
This grouped stacked bar chart visualizes population distributions across five U.S. states, broken down by age group and census year (1990, 2000, 2010). The chart uses d3.stack with stackOffsetExpand to show each age group’s proportional share within each state-year combination, with bars grouped by state and colored by age cohort. The SVG rendering relies on d3.csv for data parsing, d3.scaleBand for x-positioning, d3.scaleLinear for the y-axis, and d3.nest for restructuring the data. A custom legend labels each stacked segment directly beside its corresponding bar.
AI-generated descriptionThis grouped bar chart is constructed from a CSV file storing the populations of different states by age group. The chart employs conventional margins and a number of D3 features:
- d3.csv - load and parse data
- d3.scale.ordinal - x-position encoding and color encoding
- d3.scale.linear - y-position encoding
- d3.format - SI prefix formatting (e.g., “10M” for 10,000,000)
- d3.max - compute domains
- d3.keys - compute column names
- d3.svg.axis - display axes
forked from <a href='http://bl.ocks.org/mbostock/'>mbostock</a>'s block: <a href='http://bl.ocks.org/mbostock/3887051'>Grouped Bar Chart</a>