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Insert NA or another replacement value for some proportion of specified columns to simulate missing data.
messy(data, prop = 0, ..., replace = NA)
the messed up table
the tbl
the proportion of data to mess up
the columns to mess up (as a vector of column names or numbers)
the replacement value (defaults to NA)
messy(iris, 0.1, "Species", replace = "NO SPECIES") messy(iris, 0.5, 1:4)
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