Frequencies for first 10,000 rows of preventiveservicesprovidedat variable in ma2011 dataset :

 Preventive |
   Services |
Provided at |
  Zero Cost |
      Share |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,973       89.73       89.73
         No |         35        0.35       90.08
        Yes |        992        9.92      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 14 Apr 2016