What does the "$" mean in the following line of code?
db$Continent <- NA
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2Have you tried `?"$"` ? – moodymudskipper Apr 25 '22 at 10:27
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1There's a good explanation of data structures such as dataframes here: http://adv-r.had.co.nz/Data-structures.html#data-frames. – Carl Apr 25 '22 at 10:32
1 Answers
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Generally speaking, the $ operator is used to extract or subset a specific part of a data object in R.
In your example, you're assigning NA to Continent, as @dario pointed out in the comments.
SikorskyS60
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1This answer is wrong. In the example OP is **not** looking for the Continent NA but **assigning** NA (missing value indicator) to the column/variable `Continent` – dario Apr 25 '22 at 10:41
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Yikes, just realized that. Thanks for pointing out. I'll edit that real quick – SikorskyS60 Apr 25 '22 at 10:42