Frequencies for first 10,000 rows of rfid variable in nhamcsed2015 dataset :

  Does your |
     ED use |
      radio |
  frequency |
identificat |
 ion (RFID) |
  tracking? |      Freq.     Percent        Cum.
------------+-----------------------------------
      Blank |         57        0.57        0.57
    Unknown |        721        7.21        7.78
        Yes |      2,127       21.27       29.05
         No |      7,095       70.95      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017