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Why are these numbers not equal?
r
r-faq
floating-point
floating-accuracy
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How to sum a variable by group
r
r-faq
dataframe
aggregate
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How do I make a list of data frames?
r
r-faq
list
dataframe
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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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Split comma-separated strings in a column into separate rows
r
r-faq
string
split
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