Data analysis
The visualization displays survey data from a class, plotting each student’s programming skills against their visualization skills in a scatter plot, while a bar chart shows their average rating across all skills. The bar chart is grouped by hobbies, and clicking a bar or circle highlights the corresponding student in both views. The code uses D3’s `scaleLinear`, `scaleBand`, `axisLeft`, and `axisBottom` to build the charts, with `scaleOrdinal` for categorical colors. Data is loaded from a CSV file and rendered as SVGs.