Frequencies for first 10,000 rows of ecpoe variable in namcs2007 dataset :

  practice has |
      computer |
    system for |
    orders for |
     prescrip? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |          6        0.06        0.06
       unknown |        132        1.32        1.38
           yes |      3,325       33.25       34.63
            no |      6,467       64.67       99.30
    turned off |         70        0.70      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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