Frequencies for first 10,000 rows of share variable in nhamcsopd2001 dataset :

   do other |
 physicians |
 share care |
        for |
   problem? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        388        3.88        3.88
          1 |      3,475       34.75       38.63
          2 |      3,474       34.74       73.37
          3 |      2,663       26.63      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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