Frequencies for first 10,000 rows of eimgreso variable in nhamcsopd2008 dataset :

 does opd have |
      computer |
    system for |
    viewing of |
       imaging |
      results? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |        309        3.09        3.09
       unknown |        663        6.63        9.72
           yes |      6,980       69.80       79.52
            no |      1,943       19.43       98.95
    turned off |        105        1.05      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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