loading multiple stock data from dataset
This example displays monthly stock prices for Microsoft, Amazon, and IBM from January 2000 through March 2010, using a multi-line chart where each company’s price history is drawn as a colored line. The data is loaded from a CSV file containing symbol, date, and price columns, then grouped by symbol using `d3.nest()`. The visualization uses `d3.line()` with a basis curve, `d3.scaleTime()` for the x-axis, and `d3.scaleLinear()` for the y-axis, with an ordinal color scale for the three series. The chart is rendered as an SVG, with axes and a legend prepared via `d3.axisBottom` and `d3.axisLeft`.
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forked from <a href='http://bl.ocks.org/romsson/'>romsson</a>'s block: <a href='http://bl.ocks.org/romsson/57eb273e01761b829aaa95b28c8193c1'>loading multiple stock data from dataset</a>