Combine two data frames by rows (rbind) when they have different sets of columns

rr-faqdataframe
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Issue when passing variable with dollar sign notation ($) to aes() in combination with facet_grid() or facet_wrap()

rr-faqggplot2
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Generate a dummy-variable

rr-faq
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Why is `[` better than `subset`?

rr-faqsubsetfilter
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Showing data values on stacked bar chart in ggplot2

rggplot2graphics
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