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

 Orders for Rx or |
   lab tests sent |
    by: unknown - |
         unedited |      Freq.     Percent        Cum.
------------------+-----------------------------------
Box is not marked |      9,419       94.19       94.19
    Box is marked |        581        5.81      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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