Frequencies for first 10,000 rows of ot_srvc_cd variable in pos2013 dataset :

 Ot Srvc Cd |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      5,888       58.88       58.88
          0 |      1,202       12.02       70.90
          1 |      1,350       13.50       84.40
          2 |      1,319       13.19       97.59
          3 |        241        2.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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