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How to sum a variable by group

rr-faqdataframeaggregate
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Aggregate / summarize multiple variables per group (e.g. sum, mean)

rr-faqdataframeaggregatedata.table
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Collapse / concatenate / aggregate a column to a single comma separated string within each group

rr-faqaggregate
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How do I Pandas group-by to get sum?

pythonpandasgroup-bydataframeaggregate
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Mean per group in a data.frame

raggregate
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