How to Add an Empty Column to a Dataframe in R (with tibble)
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python - How to add a new column to an existing DataFrame? - Stack Overflow
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r - Add a new column to a dataframe using matching values of another dataframe - Stack Overflow
R Data Frame Operations - Adding Observations / Rows And Variable / Column To A Data Frame In R
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Why is mutate function not adding a new column to my table - tidyverse - Posit Community
