Frequencies for first 10,000 rows of ptprob1 variable in namcs2013 dataset :

    Share patient |
    problem lists |
   electronically |
  (not fax) with: |
   hospitals with |
           which  |      Freq.     Percent        Cum.
------------------+-----------------------------------
   Not applicable |      6,235       62.35       62.35
Box is not marked |        967        9.67       72.02
    Box is marked |      2,798       27.98      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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