Frequencies for first 10,000 rows of pt_srvc_cd variable in pos2018 dataset :

  Services: |
    PT Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      6,341       63.41       63.41
          0 |        353        3.53       66.94
          1 |      1,600       16.00       82.94
          2 |      1,370       13.70       96.64
          3 |        336        3.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Feb 2019