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Ch. 11 Summarization (The following is a list of typical functions that…
Ch. 11 Summarization
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When data is available that does not focus directly on the right unit, it must be aggregated or summarized
the data is summarized to get a new column about each customer stating what we need to find out about the customer.
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Summarize is a feature available in most programming tools and is also known under the name group or group by.
When summarizing, one or more columns by which to group data is selected, essentially creating a virtual “bucket” for each unique group.
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