Assignment 6 - Manisha (Multi-Series Chart)
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This multi-series line chart compares average housing metrics across cities using normalized 0–100 values to share a single y-axis. The dark-themed SVG visualization plots three data series for average price, area, and bedrooms, sourced from a GitHub-hosted CSV file. The code aggregates the data with `d3.rollups`, sorts cities by name, and normalizes each metric against its maximum. Using `d3.scalePoint` for the categorical x-axis and `d3.scaleLinear` for the y-axis, it renders the lines, rotated tick labels, and a color-coded legend, all styled through D3 version 7’s standard API.
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