Frequencies for first 10,000 rows of ped_srvc_cd variable in pos2009 dataset :

       SRV: |
  PEDIATRIC |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,638       86.38       86.38
          0 |        746        7.46       93.84
          1 |        561        5.61       99.45
          2 |         33        0.33       99.78
          3 |         22        0.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017