Frequencies for first 10,000 rows of ob_srvc_cd variable in pos2016 dataset :

  Services: |
 Obstetrics |
       Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      8,569       85.69       85.69
          0 |        804        8.04       93.73
          1 |        539        5.39       99.12
          2 |         40        0.40       99.52
          3 |         48        0.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 10 Jan 2017