Frequencies for first 10,000 rows of medlistunk variable in namcs2012 dataset :

 Share medication |
            lists |
   electronically |
  (not fax) with: |
          unknown |      Freq.     Percent        Cum.
------------------+-----------------------------------
   Not applicable |      6,561       65.61       65.61
Box is not marked |      3,335       33.35       98.96
    Box is marked |        104        1.04      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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