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

 Pt Srvc Cd |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      5,888       58.88       58.88
          0 |        366        3.66       62.54
          1 |      1,973       19.73       82.27
          2 |      1,376       13.76       96.03
          3 |        397        3.97      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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