Frequencies for first 10,000 rows of ped_srvc_cd variable in pos2012 dataset :

   Services |
  Provided: |
  Pediatric |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      8,606       86.06       86.06
          0 |        771        7.71       93.77
          1 |        560        5.60       99.37
          2 |         35        0.35       99.72
          3 |         28        0.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016