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How to sum a variable by group
r
r-faq
dataframe
aggregate
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Aggregate / summarize multiple variables per group (e.g. sum, mean)
r
r-faq
dataframe
aggregate
data.table
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Collapse / concatenate / aggregate a column to a single comma separated string within each group
r
r-faq
aggregate
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How do I Pandas group-by to get sum?
python
pandas
group-by
dataframe
aggregate
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Mean per group in a data.frame
r
aggregate
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