To identify missing values in the dataset

[Siriphak Pongthai]

Dear Arjan and all,

In term of missing values that could be “blank space”, “NA”, “?”, any other words or symbols.
For the previous assignment, I knew it was defined as “?” because it was written in the description. But if we check just only NA, then we couldn’t be able to detect “?” as missing value.

My question is “how can we know what kind of term that missing values were defined in this dataset?” and “what kind of commands that can be used in R to detect/identify those missing values?”

Thank you so much,
Siriphak

[Pimwadee Chaovalit]

Hi Siriphak,

Thank you for your question. I would use unique() to list all possible answers for the data.

You may also use str() or summary() on your data.

I hope that helps.

Pimwadee

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