This example features a credit history dataset in two linked D3.js charts. The first is a multi-series line chart exploring up to three quantitative variables against a numeric X-axis, with controls for axis selection and sample size limiting. The second is a combined chart where bars and a line present categorical or numeric data, and both use drop-down menus for interactive data filtering. The visualizations are built with SVG, animated scales, and rely on D3’s CSV parsing, `scaleLinear`, and axis generators.