[R] subset data frame by variable with missing value

[ramoss]

Hello,

I have a variable in a data frame that contains NA values. I just want to
subset so that I get the obs where that variable is missing.
In SAS I would do:

data missing;
  set test;
  if myvalue=' ';
run;

How can I perform this simple task in R?

Thanks in advance for your help. 



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