Frequencies for first 10,000 rows of labresunk variable in namcs2013 dataset :

Share lab results |
   electronically |
  (not fax) with: |
          unknown |      Freq.     Percent        Cum.
------------------+-----------------------------------
   Not applicable |      6,235       62.35       62.35
Box is not marked |      3,765       37.65      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017