Fork of Fork of Transforming Data 1

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Fork of Fork of Transforming Data 1

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Last edited Jul 3, 2023

Created on Jul 3, 2023

This visualization loads the classic Iris flower dataset and uses `flatRollup` and `sum` from D3 v7 to compute the average sepal length for each species, then displays the JSON summary as text. The raw data table is fetched from `data.csv`, parsed with `csvParse`, and converted to numeric types before rollup. The React-based app manages state with `setState` and renders the result inside a `<pre>` element.

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A bare minimum HTML page demonstrating use of CSS and JavaScript.

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This example displays a text-based summary of the Iris dataset, showing the average sepal length for each of the three species. Using D3 v7’s `flatRollup` and `sum` functions, it computes the mean values and renders them as JSON in a `<pre>` element. The data is loaded asynchronously via `fetch` and parsed with `csvParse`, with numeric fields coerced to numbers before aggregation. The visualization updates through a state management pattern where `setState` triggers a re-render.

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