Assignment 6 - Manisha (Housing Prices)
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This combined bar-and-line chart displays average housing prices and average living areas across multiple cities. The visualization aggregates a CSV housing dataset using `d3.csv` and `d3.rollups`, computing mean values per location. Blue bars represent average price on the left axis, while a red line with point markers shows average area on the right axis. The chart uses `d3.scaleBand` and `d3.scaleLinear` for positioning, with `d3.axisBottom`, `d3.axisLeft`, and `d3.axisRight` for tick marks. The SVG rendering includes rotated city labels and a custom legend for both metrics.
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