Frequencies for first 10,000 rows of rfid variable in nhamcsed2014 dataset :

Does ED use |
      radio |
  frequency |
identificat |
        ion |
  tracking? |      Freq.     Percent        Cum.
------------+-----------------------------------
    Unknown |      1,094       10.94       10.94
        Yes |      2,440       24.40       35.34
         No |      6,466       64.66      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 11 Apr 2017