Why are these numbers not equal?

rr-faqfloating-pointfloating-accuracy
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How to sum a variable by group

rr-faqdataframeaggregate
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How do I make a list of data frames?

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

rr-faqdataframeaggregatedata.table
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Split comma-separated strings in a column into separate rows

rr-faqstringsplit
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