Frequencies for first 10,000 rows of ot_srvc_cd variable in pos2015 dataset :

  Services: |
    OT Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      6,061       60.61       60.61
          0 |      1,188       11.88       72.49
          1 |      1,308       13.08       85.57
          2 |      1,238       12.38       97.95
          3 |        205        2.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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