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VVarshareddy2912
Last edited Jun 21, 2023
Created on Jun 21, 2023
Forked from Transforming Data

This visualization shows the average sepal length for each Iris species in the classic Fisher dataset. The example fetches a CSV file and parses it with `d3.csvParse`, converting numeric fields, then uses `d3.flatRollup` with `d3.sum` and array length to compute the per-species mean. The result is displayed as a formatted JSON string inside a `<pre>` element, which re-renders whenever the data changes.

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Transforming Data

This visualization displays the average sepal length for each iris species in the Fisher Iris dataset, computed from the raw measurements in data.csv. The code first parses the CSV with `d3.csvParse`, converts numeric fields, then uses `d3.flatRollup` and `d3.sum` to aggregate the data by species, calculating the mean sepal length per group. The result is rendered as formatted JSON text in a `<pre>` element, with the data loading process managed through a simple state machine and `fetch` to retrieve the CSV file.

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