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

  Services: |
    OT Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      6,241       62.41       62.41
          0 |      1,129       11.29       73.70
          1 |      1,206       12.06       85.76
          2 |      1,235       12.35       98.11
          3 |        189        1.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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