Frequencies for first 10,000 rows of ewhoprac variable in namcs2011 dataset :

 Orders for Rx or |
   lab tests sent |
  by: prescribing |
   practitioner - |
         unedited |      Freq.     Percent        Cum.
------------------+-----------------------------------
Box is not marked |      4,211       42.11       42.11
    Box is marked |      5,789       57.89      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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