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

rr-faqdataframeaggregatedata.table
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Replacing NAs with latest non-NA value

rzoor-faqdata.table
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Understanding exactly when a data.table is a reference to (vs a copy of) another data.table

rassignment-operatorreferencecopydata.table
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Overlap join with start and end positions

rjoinmergedata.table
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Subset rows corresponding to max value by group using data.table

rgreatest-n-per-groupdata.table
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