[R] Count missing variables in dataset

[Liaw, Andy]

Something like:

sum(sapply(dat, function(x) ! x %in% c("A", "B", "C")))

probably would work.

HTH,
Andy

> From: Jan Sabee
> 
> I have a problem about how to count missing variables in dataset.
> I have a question for my customer. They are must choice one of answer
> for example: A, B, C, D and E.
> Now, I have dataset which is the result from my question, for 
> instance:
> 
> x1 x2 x3 x4 x5
> A  A  A   B  A
> C  A  A   A  A
> B  B  A   B  A
> B  B  B   C  A
> A  B  B   B  B
> C  B  B   B  A
> 
> I know that my customer only choice A, B and C.
> Are there any way to count variables that are not include in dataset.
> I mean D and E is missing in dataset.
> 
> Thanks for your help.
> Jan Sabee
> 
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