Mobility Rate Bubble Chart
This bubble chart displays mobility rates for California universities, plotting median parent household income against the percentage of students from the bottom income quintile who reach the top quintile. The bubbles are sized by average cohort size and colored by income trend. Using D3.js v5 with d3-legend, the visualization employs d3.scaleSqrt for bubble radius, d3.scaleDiverging for color, and d3.axisBottom/axisLeft for axes. Data comes from Opportunity Insights’ Mobility Report Cards dataset.