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3
  • Use is.na() function for checking whether the value is NA or not Commented May 12, 2016 at 9:02
  • I tried the above is.na(). It showing false for values but not showing true for NA Commented May 12, 2016 at 9:05
  • Can you please include the output of str(b)? Commented May 12, 2016 at 9:10