Grouped Bar Chart
This grouped bar chart displays the population distribution across seven age groups for six U.S. states, using a distinct color for each age bracket. The chart is rendered as SVG, with bars grouped per state along the x-axis and population counts on the y-axis, formatted with SI prefixes like "10M." Built with D3 v4, the visualization loads data from a CSV file via `d3.csv`, uses `d3.scaleBand` for the x-positions and `d3.scaleLinear` for the y-axis, and applies an ordinal color scale. Axes are generated with `d3.axisBottom` and `d3.axisLeft`, and a legend is manually constructed with SVG rectangles and text.
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>