Calculate group mean, sum, or other summary stats. and assign column to original data

rr-faqmeansummarydplyr
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Use dynamic name for new column/variable in `dplyr`

rr-faqdplyr
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Drop unused factor levels in a subsetted data frame

rr-faqdataframer-factor
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R memory management / cannot allocate vector of size n Mb

rr-faqmemory-managementmatrixvector
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Order discrete x scale by frequency/value

rr-faqggplot2
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