This interactive dashboard combines a histogram and pie chart to explore categorical data. The bar chart displays frequencies for each state, and hovering over a bar updates the pie chart to show the low, mid, and high breakdown for that state. Both visualizations use D3 v3’s `d3.svg.axis` and ordinal/linear scales, with smooth transitions via `transition().duration()`. The bar chart is rendered in SVG, and hovering also updates a linked legend showing frequencies and percentages.