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Grouping in Essential Chart
Essential Chart uses Essential Grouping extensively to handle summarizing and grouping of data for chart displays.
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Essential Chart uses Essential Grouping to manipulate data to provide certain cumulative charts from instance data. The chart below shows trading volume for issues on a given day. The data in this case is a ticker-type data set that shows a time stamp, a volume value, a symbol and a price. To get the cumulative chart from this data, Essential Chart first groups the data by symbol, and then aggregates the data to get the total volume on a symbol by symbol basis.'
Chart showing summary values from grouped data
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Another chart based on the same data as the previous chart follows. But for this chart, Essential Grouping was used to filter the data to only display the results of the afternoon trades.
Chart showing summary values from Grouped Data filtered to show only the afternoon trades
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