{"version":"1.0","type":"rich","title":"Mobility Rate Bubble Chart","description":"This bubble chart visualizes the mobility rate of California universities—the percentage of students from the bottom income quintile who reach the top—against median parental household income. Circle size represents cohort size, while color encodes the trend of parents in the bottom 20% over time. The visualization uses D3.js v5 with scales for linear, square-root, and diverging color mappings, plus the d3-legend library for legends. Data comes from Opportunity Insights' Mobility Report Cards dataset, rendered as SVG bubbles with average reference lines and selected labels.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/1b12d146967d4f08b8b202e7289b602e?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}