Dynamically select data frame columns using $ and a character value

rr-faqdataframe
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Grouping functions (tapply, by, aggregate) and the *apply family

rr-faqlapplysapplytapply
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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 to convert a factor to integer\numeric without loss of information?

rr-faqcasting
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Reshaping multiple sets of measurement columns (wide format) into single columns (long format)

rr-faqreshapetidyrreshape2
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