Frequencies for first 10,000 rows of eimgrese variable in nhamcsed2007 dataset :

  does ed have |
  computerized |
    system for |
    viewing of |
       imaging |
      results? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |        103        1.03        1.03
           yes |      7,889       78.89       79.92
            no |      2,008       20.08      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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