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DTSC630-Assignment3-HJi-chart4

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YYukikaze
Last edited Mar 28, 2026
Created on Mar 26, 2026

This heatmap displays Apple’s monthly stock return percentage from 2016 to 2026, using green cells for gains and red for losses, with color intensity reflecting the magnitude of each month’s move. The visualization highlights notable events such as the late-2018 sell-off and the early-2020 COVID crash and recovery. The code loads CSV data with d3.csv, computes month-over-month returns from each month’s last close price, and renders the grid with ECharts’ heatmap series, visualMap, and tooltip APIs.

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