Frequencies for first 10,000 rows of rfid variable in nhamcsed2010 dataset :

  Does your |
     ED use |
      radio |
  frequency |
identificat |
        ion |
  tracking? |      Freq.     Percent        Cum.
------------+-----------------------------------
    unknown |        450        4.50        4.50
        yes |      1,655       16.55       21.05
         no |      7,895       78.95      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016