How to create a consecutive group number

rr-faq
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Quickly reading very large tables as dataframes

rr-faqdataframeimport
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Add legend to ggplot2 line plot

rr-faqggplot2legend
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Remove rows with all or some NAs (missing values) in data.frame

rr-faqdataframefiltermissing-data
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How to find the statistical mode?

rr-faqstatistics
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