Avoid Losing Column Names when Adding Rows to Empty Data Frame in R (Example) | Keep Variable Names

Avoid Losing Column Names when Adding Rows to Empty Data Frame in R (Example) | Keep Variable Names

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Replace NA Values in Column by Other Variable in R (Example) | Substitute NAs in Data Frame | is.na
Replace NA Values in Column by Other Variable in R (Example) | Substitute NAs in Data Frame | is.na
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