Frequencies for first 10,000 rows of labres4 variable in namcs2013 dataset :

Share lab results |
   electronically |
  (not fax) with: |
       ambulatory |
providers outside |
               yo |      Freq.     Percent        Cum.
------------------+-----------------------------------
   Not applicable |      6,235       62.35       62.35
Box is not marked |      2,800       28.00       90.35
    Box is marked |        965        9.65      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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