Frequencies for first 10,000 rows of eimgreso variable in nhamcsopd2007 dataset :

 does opd have |
      computer |
    system for |
    viewing of |
       imaging |
      results? |      Freq.     Percent        Cum.
---------------+-----------------------------------
       unknown |        160        1.60        1.60
           yes |      6,180       61.80       63.40
            no |      3,660       36.60      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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