Frequencies for first 10,000 rows of pt_srvc_cd variable in pos2017 dataset :

  Services: |
    PT Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      6,241       62.41       62.41
          0 |        381        3.81       66.22
          1 |      1,756       17.56       83.78
          2 |      1,311       13.11       96.89
          3 |        311        3.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 9 Jan 2018