Frequencies for first 10,000 rows of share variable in nhamcsopd2003 dataset :

   do other |
 physicians |
 share care |
        for |
   problem? |      Freq.     Percent        Cum.
------------+-----------------------------------
      blank |        138        1.38        1.38
        yes |      3,886       38.86       40.24
         no |      4,175       41.75       81.99
    unknown |      1,801       18.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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