bubble one more time
A force-directed bubble chart displays individual BMI measurements grouped by race and sex, with circle radius proportional to BMI value and color encoding racial categories. Using D3 v3 and SVG rendering, the visualization loads data from a CSV file and applies a cluster force layout with collision detection to arrange bubbles into distinct groups. The code implements custom `cluster` and `collide` functions alongside the `d3.layout.force` simulation, while a tooltip on mouseover reveals each bubble's race, BMI, and sex. Circles are colored via an ordinal scale and positioned through the force layout's tick handler.
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forked from <a href='http://bl.ocks.org/lydiawawa/'>lydiawawa</a>'s block: <a href='http://bl.ocks.org/lydiawawa/347e2b0aeed51d7dc56fde40b08e5fcd'>bubble one more time</a>